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

correct answer:

b.(19,-2)

0.02

step-by-step explanation:

time of 9 192 631 770 periods of the radiation corresponding to the transition between the 2 hyperfine levels of the ground state of the caesium 133 atom at 0 k (but other seconds are sometimes used in astronomy)