Daoda

Suppose there are 24 Apple in a box of which 10 are rotten. An apple is drawn at random from the box. (a) what is the probability of picking out the rotten apple (b) what is the probability that the second apple is rotten given that the first is rotten (w...

A consulting firm rent cars from three agencies: 30% from agency A, 20% from agency B and 50% from agency C. If a car rented by the firm has bad tires, find the probability that it came from: (a) agency C (b) agency A.

Thirteen staff of the school went to represent the school at a meeting. 8 of the staff has MA degree and 5 have Bsc. 7 MA and 3 BSc are males. If a staff is selected at random to head the delegation, what is the probability that: (a) the staff has a maste...

A newly wedded couple plan to have three children each boy (B) or girl (G) shown. Using the tree diagram approach, find: (a) the mean (b) what is the variance and standard deviation of the number?