answer the following questions

4. The frequency table gives the ages in years of a sample of 65 people. (5) (a) Find the sample mean. Age ( yrs) 0-9 Cut 4.5 22.5 10 - 19 14.5 159.5 20 - 29 18 24.5 441.0 30 - 39 13 34.5 448.5 40 - 49 8 44.5 356.0 50 -59 6 54.5 327.0 60- 69 64.5 193.5 70 - 79 74.5 74.5 E = 65 E=316.0 E = 2022.5 ((b) Does the data set appear to have a normal distribution? Is the distribution skewed? Explain. 5. Test scores have a mean x = 100.0 pts and a standard deviation s = 15.0 pts. What % of scores are between: () (a) 85 and 1 15 pts if it has (2)(b) 70 and 130 pts if it has () (c) 55 and 145 pts if it has a normal distribution? a uniform distribution? a normal distribution