Determining the probability and variance

Reference no: EM1314948

Q1) 80 % of illegally parked cars in large city get tickets. Sample of 100 illegally parked cars is taken

a) Determine the expected percentage of tickets issued to these 100 cars?

b) Find out the variance for percentage of tickets?

c) Find out the probability that 75% or more cars get ticketed

d) Find out the probability that the percentage of tickets issued is between 68% and 82%?

Q2) A statistics class has 282 students. Average score on midterm is a 72, and standard deviation of this population of students is 12. Suppose that grades are normally distributed. You take sample of 20 students. Determine the probability that your sample will have the average between 70 and 75?

Reference no: EM1314948

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