RICAS Data Interpretation 3

Question 1

A stem-and-leaf plot shows these values — Stem 4: leaves 2, 5, 8; Stem 5: leaves 0, 3, 3, 7. What is the median of this data set?

Accepted Answer

50

Answer

The 7 values in order are 42, 45, 48, 50, 53, 53, 57; the middle (4th) value is 50.

Question 2

A circle graph shows that 35% of students prefer soccer, 25% prefer basketball, 25% prefer swimming, and 15% prefer tennis. Which two sports together account for exactly half of all preferences?

Accepted Answer

Basketball and swimming

Answer

Basketball (25%) + Swimming (25%) = 50%, which is exactly half of all preferences.

Question 3

A table shows rainfall in inches: Jan=2, Feb=3, Mar=5, Apr=4, May=6. What is the mean monthly rainfall for these 5 months?

Accepted Answer

4 inches

Answer

Mean = (2+3+5+4+6) ÷ 5 = 20 ÷ 5 = 4 inches.

Question 4

A bar graph shows sales of 4 products. Product A sold 150, B sold 90, C sold 120, and D sold 60. What is the ratio of Product D sales to Product A sales?

Accepted Answer

2:5

Answer

60:150 simplifies to 2:5 by dividing both values by 30.

Question 5

In a line plot, an X is placed above a number for each data value. If the number line goes from 1 to 10 and there are 5 X's above the number 7, what does this mean?

Accepted Answer

The value 7 appears 5 times in the data

Answer

Each X in a line plot represents one data value, so 5 X's above 7 means the value 7 occurs 5 times.

(RICAS) Rhode Island State Practice Test

(RICAS) Rhode Island State Practice Test

RICAS Data Interpretation 3