Question 1
Solve the problem. Round the standard score to the nearest tenth before using the z-score tables. Express your answer as a percent rounded to hundredths of a percent.
The lengths of human pregnancies are normally distributed with a mean of 268 days and a standard deviation of 15 days.Assume that a random sample of 25 pregnant woman is selected and the mean is computer. What percentage of sample means will be between 265 and 271 days?
◦ 84.13%
◦ 68.26%
◦ 15.87%
◦ 99.74%
Question 2
Solve the problem. Round the standard score to the nearest tenth before using the z-score tables. Express your answer as a decimal rounded to four decimal places.
The amount of snowfall falling in a certain mountain range is normally distributed with a mean of
and a standard deviation of
What is the likelihood that the mean annual snowfall during 36 randomly picked years will exceed
◦ 0.5808
◦ 0.0808
◦ 0.0026
◦ 0.4192
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