Question

1. Find P(- 1.68 < Z < 1.68) Group of answer choices A. .9535 B. .9070...

1. Find P(- 1.68 < Z < 1.68)

Group of answer choices

A. .9535

B. .9070

C. .0465

D. .4535

2. A study of homeowners in the 5th congressional district in Maryland found that their annual
household incomes are normally distributed with a mean of $41,182 and a standard deviation of $11,990
(based on data from Nielsen Media Research).

What percentage of household incomes are greater than $30,000?
Group of answer choices

A. 31.42%

B. 82.45%

C. 32.45%

D. 17.55%

3. Suppose the weights of newborn babies at ABC hospital are normally distributed with a mean of 7.6 pounds with a standard deviation of 2.3 pounds

a.) Find the z-score of a baby that weighs 10.5 pounds.

b.) Find the probability that a baby weighs less than 10.5 pounds.  

4. Let's suppose the average temperature of Covid-19 patients on day 4 is 102.3 degrees Fahrenheit with a standard deviation of 1.8 degrees. Assume the distribution is normally distributed. Find the temperatures of the middle 40%. Round answer(s) to two decimal places.

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