QUESTION 3 Chapter 3: You are a tire manufacturer and are testing a new tire for

Question

QUESTION 3 Chapter 3: You are a tire manufacturer and are testing a new tire for sale. Looking at the sample test group data results as follows, what is the variance and standard deviation for this grouped data? Mileage #ofTires (000 25-29 16 30-34 45 35-39 78 40-44 56 45-49 21 50-54 ? 225 Variance -35.68 and Std. Dev.-5.97 O Variance 33.35 and Std. Dev.-5.83 Variance = 30 and Std. Dev. " 5.48 D Variance 39 and Std. Dev.- 6.25 QUESTION 4 Chapter 4:You have the following data on your bank employees. If selected at random, what is the probability that the employee is a college graduate? Employees of the bank College Graduate NoTotal 25 es No Total 45 25 70 70 ? 150 80 50 53

Explanation / Answer

#3.

Var = (334035 - 225*38.0667^2)/(225 - 1) = 35.69

sd = sqrt(35.69) = 5.97

Option A is correct

#4.

Total 150 employees
Out of these 80 bank employees are college graduates

Hence required probability = 80C1 / 150C1 = 80/150 = 0.53

Option C

Mileage #of Tyres(f) Midpoint(x) x*f x^2 f*x^2 25-29 16 27 432 729 11664 30-34 45 32 1440 1024 46080 35-39 78 37 2886 1369 106782 40-44 56 42 2352 1764 98784 45-49 21 47 987 2209 46389 50-54 9 52 468 2704 24336 Total 225 8565 334035

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