A certain chromosome defect occurs in only 1 in 160 adult Caucasian males. A ran

Question

A certain chromosome defect occurs in only 1 in 160 adult Caucasian males. A random sample of n = 100 adult Caucasian males is to be obtained.

(a) What is the mean value of the sample proportion p, and what is the standard deviation of the sample proportion? (Enter your mean as an exact integer, fraction, or decimal. Round your standard deviation to five decimal places.)

** for my first trial, i had 0.788 and it was WRONG, I'm not sure why it was wrong tho. can i get an answer and soluiton please? Thanks

Explanation / Answer

No, I think answer was correct, my calculation was as follows

The mean is 100 x 1/160 = 5/8

The std dev is (100 x 1/160 x 159/160) 0.788

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