Given X ~ B(12, 0.4)

What is the probability of success?

Group of answer choices

0.4

0.6

0.48

1

A survey of the mean number of cents off that coupons give was conducted by randomly surveying one coupon per page from the coupon sections of a recent Rockford newspaper. The following data were collected: 20; 75; 50; 75; 30; 55; 10; 40; 30; 55; $1.50; 40; 65; 40. Assume the underlying distribution is approximately normal.

Construct a 95% confidence interval for the population mean worth of coupons.

Find the lower limit of the confidence interval. Enter it rounded to the nearest cent (2 decimal places)

Group of answer choices

$0.33

$0.44

$0.35

$0.36

The ages of workers in the Illuminex plant are approximately normally distributed, with a mean of 45 years and a standard deviation of 12 years. A worker is stopped at random and asked to fill out a questionnaire. What is the probability that this worker is more than 56 years old?

Group of answer choices

0.8212

0.1788

0.1056

0.92