According to insurance records, a car with a certain protection system will be recovered 85% of the time. if 100 stolen cars are randomly selected, what is the mean and standard deviation of the number of cars recovered after being stolen?

Write 85% as a decimal: 0.85

To find the mean, multiply the sample by the percentage:

Mean = 100 x 0.85 = 85

The standard deviation formula: √n*p*(1-p)

n = sample

p = percentage

Standard deviation = √(100 * 0.85 * (1-0.85)

Standard deviation = 3.57

answer: there are x+184 pages in olivia's book.

step-by-step explanation:

let the total number of pages in the book which olive has already read be x.

then if olive has 184 pages left to read, then the total number of pages are in olive's book= pages she has read+pages she has left to read

therefore, the total number of pages in olivia's book=

hence, there are x+184 pages in olivia's book.