OSAT Secondary Mathematics 3

Question 1

A data set has values: 4, 7, 7, 9, 11, 13. What is the median?

Accepted Answer

8

Answer

7

Answer

9

Answer

10

Question 2

A bag contains 4 red, 3 blue, and 5 green marbles. What is the probability of drawing a blue marble?

Accepted Answer

1/4

Answer

1/3

Answer

1/5

Answer

1/6

Question 3

Which measure of central tendency is most affected by extreme values (outliers)?

Accepted Answer

Mean

Answer

Mode

Answer

Median

Answer

Range

Question 4

In a normal distribution, approximately what percentage of data falls within one standard deviation of the mean?

Accepted Answer

68%

Answer

50%

Answer

95%

Answer

99.7%

Question 5

A scatter plot shows that as one variable increases, the other also increases. What type of correlation is this?

Accepted Answer

Positive correlation

Answer

Negative correlation

Answer

No correlation

Answer

Perfect correlation

Question 6

What does the interquartile range (IQR) measure?

Accepted Answer

The spread of the middle 50% of the data

Answer

The difference between the maximum and minimum values

Answer

The average distance from the mean

Answer

The most frequently occurring value