NCDAP Data Analysis & Statistics

Question 1

A student scored 72, 85, 90, 68, and 95 on five tests. What is the mean (average) score?

Accepted Answer

82

Answer

The mean is calculated by adding all scores (72+85+90+68+95=410) and dividing by the count (410÷5=82).

Question 2

What is the median of the following data set: 3, 7, 1, 9, 4, 6, 2?

Accepted Answer

4

Answer

After ordering the values (1, 2, 3, 4, 6, 7, 9), the median is the middle value, which is 4.

Question 3

In a data set of 8 values, what is the position of the median?

Accepted Answer

Between the 4th and 5th values

Answer

When a data set has an even number of values, the median is the average of the two middle values — here the 4th and 5th.

Question 4

The mode of the data set 5, 8, 3, 5, 9, 2, 5, 8 is:

Accepted Answer

5

Answer

The mode is the value that appears most often; 5 appears three times, more than any other value.

Question 5

A bar graph shows monthly rainfall. January had 3 inches, February had 5 inches, and March had 4 inches. What was the total rainfall for these three months?

Accepted Answer

12 inches

Answer

Adding the three months: 3 + 5 + 4 = 12 inches total rainfall.

(NCDAP) North Carolina Diagnostic Placement Test Practice Test

(NCDAP) North Carolina Diagnostic Placement Test Practice Test

NCDAP Data Analysis & Statistics