1- a local university administers a comprehensive examination to the candidates for b. s. degrees in business administration. five examinations are selected at random and scored. the scores are shown below. grades 80 90 91 62 77 a. compute the mean and the standard deviation of the sample. b. compute the margin of error at 95% confidence. c. develop a 95% confidence interval estimate for the mean of the population. assume the population is normally distributed.

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)

60 musicians applied for a job at a music school. 14 of the musicians play both guitar and drums, 28 play drums, 18 play the guitar. what is the probability that the applicant who gets the job plays drums or guitar?

Unaware that 35% of the 10000 voters in his constituency support him, a politician decides to estimate his political strength. a sample of 200 voters shows that 40% support him. a. what is the population? b. what is the parameter of interest? state its value c. what is the statistics of the interest? state its value d. compare your answers in (b) and (c) is it surprising they are different? if the politician were to sample another 200 voters, which of the two numbers would most likely change? explain