In a study of 11,000 car crashes, it was found that 5720 of them occurred within 5 miles of home. use a .05 significance level to test the claim that more than 50% of car crashes occur within 5 miles of home. use our 4-step procedure.

Claim is true

Step-by-step explanation:

n = 11000

x = 5720

Claim : more than 50% of car crashes occur within 5 miles of home.

We will use one sample proportion test  

Formula of test statistic =

                                       =

                                       =4.19

Significance level = 0.05

z at 0.05 = 1.64

Since calculated z > defined z

So, null hypothesis is rejected

Hence the claim is true that 50% of car crashes occur within 5 miles of home.

94

step-by-step explanation:

average the numbers and use a variable to figure out the minimum to get a 90.

(79+94+91+92+x)/5=90

x = 94