SECTION 2.3 Measures of Central Tendency 77 In Exercises 37– 40, without performing any calculations, determine which measure of central tendency best represents the graphed data. Explain your reasoning. 37. Every 1−3 years Every 4−5 years Stayed at one Every 6−10 years Response 250 500 750 1000 1250 Frequency How Often Do You Change Jobs? job for more than 10 years 38. 70 71 72 73 74 75 76 77 Height (in inches) 1 2 3 4 5 6 7 Frequency Heights of Players on Two Opposing Volleyball Teams (Source: Jobvite) 39. 55 60 65 70 75 80 85 Heart rate (in beats per minute) 5 10 15 20 25 30 40 45 35 Frequency Heart Rates of a Sample of Adults 40. 18 20 22 24 26 28 30 BMI 1 2 3 4 5 6 8 9 7 Frequency Body Mass Indexes (BMI) of People in a Gym Finding a Weighted Mean In Exercises 41– 46, find the weighted mean of the data. 41. Final Grade The scores and their percents of the final grade for a statistics student are shown below. What is the student’s mean score? Score Percent of final grade Homework 85 5% Quizzes 80 35% Project/Speech 100 35% Final exam 93 25% 42. Final Grade The scores and their percents of the final grade for an archaeology student are shown below. What is the student’s mean score? Score Percent of final grade Quizzes 100 20% Midterm exam 89 30% Student lecture 100 10% Final exam 92 40% 43. Account Balance For the month of April, a checking account has a balance of $523 for 24 days, $2415 for 2 days, and $250 for 4 days. What is the account’s mean daily balance for April? 44. Credit Card Balance For the month of October, a credit card has a balance of $115.63 for 12 days, $637.19 for 6 days, $1225.06 for 7 days, $0 for 2 days, and $34.88 for 4 days. What is the account’s mean daily balance for October?
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