Question

According to a survey conducted by Deloitte in 2017, 0.43 of U.S. smartphone owners have made an effort to limit their phone use in the past. In a sample of 81 randomly selected U.S. smartphone owners, approximately __________ owners, give or take __________, will have attempted to limit their cell phone use in the past. Assume each pick is independent.

1)	34.83 , 4.456

2)	34.83 , 19.90

3)	4.456 , 34.83

4)	81 , 4.456

5)	34.83 , 0.43

Answer 1

Answer :

given data :-

sample random = 81

n = 81

probability = 0.43

p = 0.43

q = 1-p

q = 1- 0.43

q = 0.57

smart phone approximately = n*p

= 81 * 0.43

= 34.83

have attempt to limit there cell phones = n * p * q

= 81 * 0.43 * 0.57

= 19.90

In a sample of 81 randomly selected U.S. smartphone owners, approximately 34.83 owners, give or take 19.90  will have attempted to limit their cell phone use in the past. Assume each pick is independent.

the correct answer is

option : 2