SOLUTION: 1. If the probability of a defective bolt is 0.1. Find (a) the mean (b) the standard deviation for the distribution if bolts in a total of 400. 2. Out of 800 families with fo

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Question 610764: 1. If the probability of a defective bolt is 0.1. Find
(a) the mean
(b) the standard deviation for the distribution if bolts in a total of 400.
2. Out of 800 families with four children each, how many families would expected to have:
(a) 2 boys and 2 girls
(b) atleast one boy
(c) no girl
(d) atmost two girls ?
Assuming equal probabilities for boys and girls.

Answer by solver91311(24713) (Show Source):
You can put this solution on YOUR website!

Where is the sample size and is the probability of success on any individual trial.

For , we note that

Just substitute the sample size if you have it or leave the answer as is if not.

Where is the sample size and is the probability of success on any individual trial.

Plug in your numbers and do the arithmetic.

John

My calculator said it, I believe it, that settles it