Stat Final

A teacher wanted to analyse the performance of two sections of students in a mathematics test of 100 marks. Looking at their performances, she found that a few students got under 20 marks and a few got 70 marks or above. So she decided to group them into intervals of varying sizes as follows 0 – 20, 20 – 30, …, 60 – 70, 70 – 100. Then she formed the following table Find the probability that a student obtained less than 20% in the mathematics test

• 7/90

• 20/90

• 15/90

• 1/90

What is the standard deviation for the data given:

5, 10, 7, 12, 0, 20, 15, 22, 8, 2

• 6.89

• 10.1

• 7.26

• 9

What is the standard deviation for the data given:
{12, 13, 29, 18, 61, 35, 21}

• 293.67

• 15.87

• 17.14

• 41.98

Calculate the MODE for the data set: 6, 7, 12, 8, 7, 4, 8, 8, 7

• 7

• 7.44

• 8

• 7 and 8

33, 25, 42, 25, 31, 37, 46, 29, 38
What is the third quartile of the data?

• 37

• 38

• 40

• 46

33, 25, 42, 25, 31, 37, 46, 29, 38
What is the interquartile range of the data?

• 8

• 9

• 13

• 21

Which one of the following is referred to as the population mean?

• µ

• s

• σ

• χ

Use the following box and whisker plot to identify what percent of scores are below 82?

Using the box and whisker, what percent of scores fall between 82 and 93?

Using the box and whisker plot, describe the shape of the distribution of test scores.