The weights of the fish in a certain lake are normally distributed with a mean

The weights of the fish in a certain lake are

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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
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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)?
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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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