Only question 6.15

EXERCISES 251 6.15 Consider a normal population with mean 150 and standard deviation 10. Find the following. (a) The first quartile (b) The 65th percentile (c) The percentile rank of the data value 165 (d) The percentile rank of the data value 145 6.16 Consider a normal population with mean 200 and standard deviation 25. Find the following. - (a) The third quartile (b) The 35th percentile (c) The percentile rank of the data value 211 (d) The percentile rank of the data value 150 6.17 Here is a normal curve for a random variable x with mean 70 and standard deviation 10. Find the areas A, B, C, and D. B C A 51.7 70 76 91