SC READY Data Analysis, Statistics & Probability 1 — Questions and Answers
Question 1: A class recorded the number of books read by each student in a month: 2, 5, 3, 7, 5, 4, 5. What is the mode of this data set?
- 4
- 5 (Correct answer)
- 3
- 7
Correct answer: 5
The mode is 5 because it appears three times, more than any other value in the data set.
Question 2: A student scored 72, 85, 90, 68, and 95 on five tests. What is the mean (average) score?
- 80
- 82 (Correct answer)
- 85
- 78
Correct answer: 82
Adding the scores gives 410, and dividing by 5 tests gives a mean of 82.
Question 3: A bag contains 4 red marbles, 3 blue marbles, and 3 green marbles. What is the probability of randomly selecting a blue marble?
- 3/7
- 3/4
- 3/10 (Correct answer)
- 1/3
Correct answer: 3/10
There are 3 blue marbles out of 10 total marbles (4+3+3=10), so the probability is 3/10.
Question 4: The daily high temperatures for one week were: 78, 82, 75, 90, 82, 79, 85. What is the range of these temperatures?
- 10
- 12
- 15 (Correct answer)
- 7
Correct answer: 15
The range is calculated by subtracting the minimum (75) from the maximum (90): 90 − 75 = 15.
Question 5: A line graph shows a store's sales rising from January through June, then dropping sharply in July. What does this pattern most likely indicate?
- Sales are consistently growing throughout the year
- Sales peaked in June and then declined (Correct answer)
- The store closed in July
- Data was not recorded in July
Correct answer: Sales peaked in June and then declined
A rise followed by a sharp drop indicates sales reached their highest point in June and decreased in July.
Question 6: Students surveyed their classmates about favorite sports. The results were: Soccer 12, Basketball 8, Baseball 5, Swimming 5. What fraction of students chose Soccer?
- 2/5 (Correct answer)
- 2/3
- 4/10
- 2/6
Correct answer: 2/5
Total students = 12+8+5+5 = 30; Soccer fraction = 12/30 = 2/5.
Question 7: A spinner has 8 equal sections numbered 1 through 8. What is the probability of landing on an even number?
- 1/4
- 1/2 (Correct answer)
- 3/8
- 5/8
Correct answer: 1/2
Even numbers on the spinner are 2, 4, 6, and 8 — that is 4 out of 8 sections, which equals 1/2.
SC READY Data Analysis, Statistics & Probability 1
A class recorded the number of books read by each student in a month: 2, 5, 3, 7, 5, 4, 5.
What is the mode of this data set?