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9. The amount of time, in minutes, that a person must wait for a bus is uniformly distribute it between 1 and 15 minutes, Inclusive.

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9. The amount of time, in minutes, that a person must wait for a bus is uniformly distribute it between 1 and 15 minutes, Inclusive. Find P (X>11|x>8) 10. The amount of time, in minutes, that a person must wait for a bus is uniformly distributed between one and 15 minutes, inclusive find the 80th percentile. 11. What is the value of X is one standard deviation to the left of the mean if X ~ N (5, 1) 12. What is the Z - score of X = 3 if X ~N (7,2) 13. What is the Z - score of X = 3 If it is one standard deviation to the left of the mean? 14. About what percent of X values from a normal distribution lie within one standard deviation (left and right) the mean of the distribution? 15. In a normal distribution, about what percent of X values lie between the first and second standard deviation (both sides) 16. Time in a particular dentist sentence deviation of 6 minus find the probability that the wait time is less than 15 min. 17. Suppose the wait time in particular dentist office is known to be normally distributed with a mean of 30 minutes and standard deviation of 6 minutes find the probability that the wait time is at least 20 minutes. 18. Suppose the wait time in a particular dentist office is known to be normally distributed with a mean of 30 minutes and a standard deviation of 6 minutes find the probability that the wait time is between 25 and 30 mins 19. Suppose the wait time in a particular dentist office is known to be normally distributed with a mean of 30 minutes and a standard deviation of 6 minutes find the 81st percentile. 20. Suppose the wait time in a particular dentist office is known to be normally distributed with a mean of 30 mins and a standard deviation of 6 mins. Calculate the interquartile range

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