Question 10 of 205.0/ 5.0 PointsThe weights of the fish in a certain lake are normally distributed with a mean of 20 lb and a standard deviation of 6. If 9 fish are randomly selected, what is the likelihood that the mean weight will be between 17.6 and 21.6 lb?
A. 0.9370 B. 0.6800 C. 0.6730 D. 0.0968

Question 11 of 205.0/ 5.0 PointsThe diameters of bolts produced by a certain machine are normally distributed with a mean of 0.25 inches and a standard deviation of 0.01 inches. What percentage of bolts will have a diameter greater than 0.24 inches?
Question 12 of 205.0/ 5.0 PointsThe annual precipitation amounts in a certain mountain range are normally distributed with a mean of 88 inches, and a standard deviation of 10 inches. What is the likelihood that the mean annual precipitation during 25 randomly picked years will be less than 90.8 inches?
Question 13 of 205.0/ 5.0 PointsWhich of the following statements concerning the standard normal curve is/are true (if any)?

d) The area under the standard normal curve to the left of any z-score is less than 1.
A. a, b B. b, d C. a, c D. a
Question 14 of 205.0/ 5.0 PointsThe lifetimes of projector bulbs of a particular type are normally distributed with a mean of 470 hours and a standard deviation of 15 hours. What percentage of the bulbs has lifetimes that lie within 2 standard deviations of the mean on either side?Apply the 68-95-99.7 rule to this question.

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- Spring '19
- Normal Distribution, Standard Deviation, Jen, 15 hours, 13.59%, 21.6 lb