Ask a New Question

Question

a random sample of the grade of 78 students is taken. what is the probability that the average grade will be between 80.3% and 82.3%?
12 years ago

Answers

PsyDAG
Need a measure of central tendency (mean) and a measure of variability (standard deviation).

Z = (score-mean)/SD

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to the Z scores.
12 years ago

Related Questions

If a grade was drawn at random from the data shown below, what is the probability that the grade is... For a random sample of 10 men, the mean head circumference is x = 57.3 cm and the sample standard de... Consider a random sample with sample mean x. If the sample size increased from n = 40 to n = 360, th... a. In a random sample of 500 observations , we found the proportion of successes to be 48%. Estimate... 5. The following random sample was selected : 4, 6, 3, 5, 9, 3. Find the 95% confidence interval f... Please help- A random sample of n=500 households where 150 have combined cable,phone, and internet s... Among a random sample of 500 college students, the mean number of hours worked per week at non-colle... In a random sample of 8th grade students, 54 said that pi is equal to 22/7, 37 said pi is equal to 3... A random sample of 59 second graders in a certain school district are given a standardized mathemati...
Ask a New Question
Archives Contact Us Privacy Policy Terms of Use