1

What is the purpose of frequency distribution in economic analysis?

A

To organize data into classes

B

To calculate the mean

C

To find extreme values

D

To create a scatter plot

CORRECT OPTION:
a

2

Which of the following is not a step to construct a frequency distribution

A

Determine the range of the data

B

Decide on the number of intervals (or classes)

C

Determine the average value of the set of data

D

Determine the width of the intervals

CORRECT OPTION:
c

3

Suppose a teacher wants to analyze the test scores of their students in a math class. The scores range from 0 to 100, and there are 30 students in the class. The teacher groups the scores into intervals of 10 points each (0-9, 10-19, 20-29, and so on). The following table shows the frequency distribution of the test scores:

Interval |
Frequency |

0 - 9 |
2 |

10-19 |
4 |

20-29 |
6 |

30-39 |
5 |

40-49 |
3 |

50-59 |
5 |

60-69 |
2 |

70-79 |
2 |

** **

80-89 |
1 |

** **

Find the percentage of students who scored less than 50 on the test.

To solve the problem, we need to add up the frequencies for the intervals 0-9, 10-19, 20-29, 30-39, and 40-49, since these are the intervals where the scores are less than 50. The total frequency for these intervals is:

2 + 4 + 6 + 5 + 3 = 20

Therefore, 20 out of the 30 students scored less than 50 on the test. To find the percentage, we divide 20 by 30 and multiply by 100:

(20/30) x 100 = 66.67%

So, 66.67% of the students scored less than 50 on the test.

Pages: