The probability is 0.2 that a person shopping at a certain store will spend less than $20. for groups of size 17, find the mean number who spend less than $20. a. 16.0 b. 13.6 c. 3.4 d. 4.0

The correct option is :  C.  3.4

Step-by-step explanation:

The probability that a person shopping at a certain store will spend less than $20 is 0.2

That means, here  

Given that, the sample size

So, the Mean

Thus, the mean number who spend less than $20 will be  3.4

f(x) = - 2/3x + 5; f(5/2)

substitute 5/2 in for x:

f(5/2) = -2/3(5/2) + 5

simplify the right side:

f(5/2) = -5/3 + 5

f(5/2) = 10/3

answer:

f(5/2) = 10/3

i hope this you!