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Homework 10
Homework 10
1. Draw the standard normal distribution. Shade the area between the z-score of -1.46 and 0.84. Find the shaded area. Round to the nearest ten-thousandth.
2. Draw the standard normal distribution. Shade the area between the z-score of -2.27 and 1.99. Find the shaded area. Round to the nearest ten-thousandth.
3. Draw the standard normal distribution. The shaded area to the left of the z-score is 0.0314. Find the z-score. Round to the nearest hundredth.
4. Suppose that replacement times for washing machines are normally distributed with a mean of 5.1 years and a standard deviation of 3.7 years. Find the replacement time that separates the top 1.1% from the rest. Round to the nearest hundredth.
5. Scores on a test are normally distributed with a mean of 64 and a standard deviation of 10. What percent of scores are more than 69. Express the answer as a percentage rounded to the nearest hundredth without the % sign.