Opinion polls find that 20% of Americans adults claim that they don\'t get enoug

Question

Opinion polls find that 20% of Americans adults claim that they don't get enough sleep. Suppose you take a random sample of 200 American adults and count the number X in your sample that claim that they never have time to relax. The mean of X is Select one: a. 40 b. 168 c. 32 d. 160 Opinion polls find that 20% of Americans adults claim that they don't get enough sleep. Suppose you take a random sample of 200 American adults and count the number X in your sample that claim that they never have time to relax. The standard deviation of X is Select one: a. 32 b. 6.32 c. 5.66 d. 40

Explanation / Answer

22.

As

u = n p

and n = 200, p = 0.20,

So

u = 200*0.20 = 40 [ANSWER, A]

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23.

Also,

sigma = sqrt(np(1-p))

= sqrt(200*0.20*(1-0.20))

= 5.656854249 [ANSWER, C]

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