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Muhammad

Questions (58)

The sum of two numbers is 21.two-thirfs of the other number to give 15.find the two numbers showing clearly your working
1. 2 answers
2. 170 views
Each of 16 students measured the circumference of a tennis ball by four different methods, which were: Method A: Estimate the
1. 0 answers
2. 167 views
binomial distribution has probability function P (X=x)=k (1/3)^x (2/3)^7-x , where x=0,1,2,3,4,5,6,7Find mean and varience.
1. 1 answer
2. 87 views
A binomial distribution has probability function P (X=x)=k (1/3)^x (2/3)^7-x , where x=0,1,2,3,4,5,6,7Find mean and varience.
1. 0 answers
2. 92 views
Calculate the area of sector of a circle which subtends an angel of 45°at the center of the circle, radius 14cm. Solve this
1. 4 answers
2. 417 views
If a wire has a resistance of 1.32 a lenth of 110cm and area of cross sectional of 0.00415cm, The final resistivity of which it
1. 0 answers
2. 262 views
5-kg box is released from rest on a frictionless incline has a uniform acceleration of 0.24 m/s2, what is the velocity of the
1. 1 answer
2. 933 views
An aero plane flies from a town X on a bearing of N45°E to another town Y, a distance of 200km. it then changes course and
1. 2 answers
2. 401 views
The density of mercury is 1•36×10^4kgm^3 at 0°c.calculate it values at 100°c and at 22°c take 3 linear expansivity if
1. 2 answers
2. 306 views
Let X and Y be independent normal random variables.a) Is 2X−4 always normal? b) Is 3X−4Y always normal? c) Is X^2+Y always
1. 3 answers
2. 1,994 views
Every person has a random number of children, drawn from a common distribution with mean 3 and variance 2. The numbers of
1. 1 answer
2. 2,473 views
The random variable X has a standard normal distribution. Find the PDF of the random variable Y , where:1. Y = 5X−7 . 2. Y =
1. 3 answers
2. 2,930 views
Let X be a uniform random variable on the range {−1,0,1,2}. Let Y=X^4. Use the expected value rule to calculate E[Y].E[Y]=
1. 0 answers
2. 891 views
For each of the following statements, state whether it is true (meaning, always true) or false (meaning, not always true):1. Let
1. 1 answer
2. 1,658 views
Suppose a random variable X can take any value in the interval [−1,2] and a random variable Y can take any value in the
1. 1 answer
2. 2,579 views
We have two coins, A and B. For each toss of coin A, we obtain Heads with probability 1/2; for each toss of coin B, we obtain
1. 1 answer
2. 1,983 views
Is it always true that E[X2]≥(E[X])2 ?Yes or No
1. 0 answers
2. 225 views
Suppose that Var(X)=2 . The variance of 2−3X is: Var(2−3X)
1. 1 answer
2. 1,228 views
The sum of 9 and a certain number one and times the first number.find the number.
1. 1 answer
2. 311 views
In a certain examination, 52 candidates offered Biology, 60 candidates offered History and 96 offered Mathemathics, if 21
1. 6 answers
2. 1,374 views
A ship, proceeding southward on a straight course at the rate of 12 miles/hr is, at noon,40 miles due north of a second ship,
1. 1 answer
2. 726 views
Emily hired a new employee to work in your bake shop. In one hour the employe burned 660 chocolate chip cookies. If this
1. 2 answers
2. 489 views
3/5+3/17=2 1/2 1 0 need help
1. 3 answers
2. 353 views
Shopkeeper sells his goods at 20% above the cost price. What will be the percentage profit he will earn if he discounts the
1. 1 answer
2. 738 views
There are fifty students in a class. In a 100 marks exam, 20 students scored less than 30 marks, 5 students scored more than 70
1. 1 answer
2. 848 views
Which of the following scenarios is the best example of negative reinforcement? a. Vanna fastens her seatbelt as soon as she
1. 2 answers
2. 3,527 views
Which of the following scenarios is the best example of positive reinforcement?A. Maria now buys a different brand of cigarettes
1. 2 answers
2. 1,374 views
15. How might adolescents’ tendency to engage in such risky behaviors as unsafe sex and experimental drug use reflect brain
1. 3 answers
2. 1,479 views
charles has been told by the doctor he has lung cancer that is beyond treatment. His doctor tells him that he will probably die
1. 3 answers
2. 690 views
7. Research examining the perceptual abilities of newborn and very young infants has:a) provided little information regarding
1. 5 answers
2. 1,074 views
The diameter of a bicycle wheel is 14 cm.What is the distance covered by it in 50 revolution
1. 1 answer
2. 646 views
Alisha is paying $20 for a large pizza,which is 18 inches in diameter, a better buy than paying $5 for a personal size pizza
1. 1 answer
2. 615 views
The number of people expected to have a disease in t years is given byy(t) = A.3^(t/a) (i) If now (year 2016) the number of
1. 1 answer
2. 545 views
The base of a solid is the circle x2 + y2 = 9. Cross sections of the solid perpendicular to the x-axis are equilateral
1. 1 answer
2. 6,042 views
Find the volume of the solid formed by rotating the region bounded by the graph of y equals 1 plus the square root of x, the
1. 3 answers
2. 2,015 views
Find dz/dy for the following :z=(e^xy)+2ycos(xy-1)
1. 1 answer
2. 410 views
Determine the relative extremum for the function ,f(x,y)=((x^2)+(y^2))(e^-x)
1. 1 answer
2. 446 views
Find dz/dy for the following :xln(1-2y) = zsin((x^2)z)-3y+z
1. 1 answer
2. 445 views
The base of a triangle is decreasing at the rate of 2 cm/ min and the height is increasing at the rate of1cm/ min. Find the rate
1. 1 answer
2. 1,578 views
The number of people expected to have a disease in t years is given byy(t) = A.3^(t/a) (i) If now (year 2016) the number of
1. 2 answers
2. 615 views
Two ants, red ant and black ant, creeping along lines in 3-space. At time t, red ant is at point on the linex=3-t , y-2=2t ,
1. 2 answers
2. 596 views
A perfect gas at 415 degree centigrade. The volume remains constant at 20 cubic meters and pressure of 1750 Gauge. Calculate the
1. 0 answers
2. 400 views
the oxygen produce was colleced by displement method at (22c)at a total pressure of (754torr)the vapor pressure of water at
1. 0 answers
2. 454 views
you are baking cookies. recipe 2 cup sugar1-1/2 cup flour 2 eggs a- you make one and one-half batches of cookies, how many eggs
1. 0 answers
2. 736 views
an ideal system absorbed some amount of heat and gas expand and the piston move to 0.4 meter against than the atmospheric
1. 0 answers
2. 425 views
Assume that there is no friction between m2 and the incline, that m2 = 1.8 kg, m1 = 1.4 kg, the radius of the pulley is 0.10 m,
1. 0 answers
2. 502 views
Hero in long way from Chicago book why
1. 1 answer
2. 473 views
Why 0!=1 Plz help me to prove this statement.
1. 2 answers
2. 502 views
Find the product and write in lowest terms.10/51.3/8
1. 2 answers
2. 738 views
Sodium thiosulfate, Na2S2O3, is used as a fixer in photographic film developing. The amount of Na2S2O3 in a solution can be
1. 1 answer
2. 1,773 views
how many sig figs in this number: 32.6721
1. 2 answers
2. 561 views
Approximate the followin. 1.2.7272to 2d.p
1. 1 answer
2. 1,065 views
1000g of a 55%(mass percentage) nitric acid solution is to be diluted to 20%(mass percentage) nitric acid solution.how many
1. 2 answers
2. 611 views
1000g of a 55%(mass percentage) nitric acid solution is to be diluted to 20%(mass percentage) nitric acid solution.how many
1. 1 answer
2. 527 views
How many moles of Fe3O4 are required to supply enough iron to prepare 0.442 mol Fe2O3?
1. 2 answers
2. 4,578 views
A rocket carrying a satellite is accelerating straight up from the earth's surface. At 1.20 after liftoff, the rocket clears the
1. 0 answers
2. 569 views
I Have an assignment that requires me to design, write and carry out an analysis and a report of survey from beginning to end
1. 2 answers
2. 548 views
Find the distance (measured in earth radii, RE) from the center of the earth to a point outside the earth where the acceleration
1. 2 answers
2. 982 views

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