Calculating the Mean

Question 1

Sam's class took a science quiz and the five scores were 72, 84, 88, 91, and 95. The mean (average) score is 86. Which statement best describes what this mean tells us?

Accepted Answer

It shows a typical score for the class; it is found by adding all the scores together and dividing by the number of students, and it may not be any one student's actual score.

Answer

It is the score that most of the students received.

Answer

It is the highest score that any student earned on the quiz.

Answer

It is the middle score when the scores are listed from lowest to highest.

Question 2

A bakery recorded the number of cupcakes sold each day for a week. The numbers are: Monday 45, Tuesday 52, Wednesday 38, Thursday ?, Friday 47, Saturday 50, Sunday 44. The average (mean) number of cupcakes sold per day that week was 46. How many cupcakes were sold on Thursday?

Accepted Answer

46

Answer

41

Answer

48

Answer

50

Question 3

A box contains 4 yellow, 7 orange, and 9 purple pencils. One pencil is selected at random. What is the probability that the selected pencil is either yellow or purple?

Accepted Answer

13/20

Answer

7/20

Answer

9/20

Answer

4/20

Try three questions

Sam's class took a science quiz and the five scores were 72, 84, 88, 91, and 95. The mean (average) score is 86. Which statement best describes what this mean tells us?

A bakery recorded the number of cupcakes sold each day for a week. The numbers are: Monday 45, Tuesday 52, Wednesday 38, Thursday ?, Friday 47, Saturday 50, Sunday 44. The average (mean) number of cupcakes sold per day that week was 46. How many cupcakes were sold on Thursday?

A box contains 4 yellow, 7 orange, and 9 purple pencils. One pencil is selected at random. What is the probability that the selected pencil is either yellow or purple?

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