According to the World Health Organization, distribution of height in centimeters for girls aged five years and no months has the distribution:X~N(109, 4.5).

What is thez-score for a height of 98 centimeters?

Group of answer choices

-2.4

-0.86

0.86

2.4

Body temperature is known to be distributed normally among healthy adults.You collect data from a random sample of 20 healthy adults and find that your sample temperatures have a mean of 98.4 and a sample standard deviation of 0.3 (both in degrees Fahrenheit).

What is the 95% confidence interval critical value you will use?

Group of answer choices

2.093

1.96

1.645

2.086

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