The State of Nevada has seatbelt laws for drivers. It is known that 68 % of the drivers wear seatbelts. A sample of six drivers is selected. The average number of people you should expect to find wearing their seatbelt is A. 4.08
B. 3.34
C. 6.68
D. 4.26

A . 4.08

The average number of people you should expect to find wearing their seat belt is

 μ= n p   = 4.08

Step-by-step explanation:

Step(i):-

Given the probability that drivers wear seat belts

              p = 68% =0.68

Given sample size 'n' =6

we will use binomial distribution

mean of the binomial distribution μ= n p

step(ii):-

The average (0 r) mean of the binomial distribution

                                                  μ= n p  = 6 X 0.68 = 4.08

The standard deviation of the binomial distribution

                                            σ = √npq

                                               =

Final answer:-

The average number of people you should expect to find wearing their seat belt is

 μ   = 4.08

The standard deviation of the people you should expect to find wearing their seat belt is

σ = 1.142

use this formula:

p(a\b) = p(a and b)/p(b).

take it from here.