GAT Mathematics and Numeracy 2

Question 1

In a class of 40 students, 16 are boys. What percentage of the class are girls?

Accepted Answer

60%

Answer

Girls = 40 − 16 = 24; percentage = 24/40 × 100 = 60%.

Question 2

What is the mean of the values 4, 8, 12, 6, 10?

Accepted Answer

8

Answer

Mean = (4 + 8 + 12 + 6 + 10) ÷ 5 = 40 ÷ 5 = 8.

Question 3

A bag contains 4 red, 6 blue, and 2 green balls. What is the probability of randomly selecting a green ball?

Accepted Answer

1/6

Answer

Probability = 2 ÷ (4 + 6 + 2) = 2/12 = 1/6.

Question 4

What is the range of the data set: 12, 5, 19, 8, 23?

Accepted Answer

18

Answer

Range = Maximum − Minimum = 23 − 5 = 18.

Question 5

Which measure of central tendency is most affected by extreme outlier values?

Accepted Answer

Mean

Answer

The mean uses the actual numerical value of every data point, so extreme values can significantly skew it.

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