[15 pts] The scores ofa sample of 5 students, selected from a large population, are given below. Score 70 80 60 90 75 a) b) c) [5 pts] Determine a point estimate for the variance of the population. [5 pts] Determine a 98% confidence intercal for the variance of the population. [5 pts] At the 50/0 level of significance, test to determine if the variance of the population is less than or equal to 50.