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Focus · Grades 9-12

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Statistics Practice 1: Grouped Data And Mean

Practise focused skills from Statistics

MathematicsGrade 10Mixed10 questions20 min
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Concept Check · 5 questionsApply and Analyse · 5 questions
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Concept Check

Grouped data, class marks and direct mean.

Choose the best answer for each question.

Question 1
EasyQuestion

In the grouped table 0−10:4,10−20:7,20−30:90-10:4, 10-20:7, 20-30:9, what is the class width?

Topic: Grouped Data Basics · Skill: Read grouped frequency distributions

Question 2
MediumQuestion

For the class interval 40−5040-50, which pair represents its lower and upper limits?

Topic: Grouped Data Basics · Skill: Read grouped frequency distributions

Question 3
EasyQuestion

What is the class mark of the interval 20−3020-30?

Topic: Grouped Data Basics · Skill: Find class marks

Question 4
MediumQuestion

The intervals are 10−20,20−30,30−4010-20,20-30,30-40. Which list gives their class marks?

Topic: Grouped Data Basics · Skill: Find class marks

Question 5
MediumQuestion

For grouped data with class marks 5,15,255,15,25 and frequencies 2,3,52,3,5, what is the mean?

Topic: Mean · Skill: Compute mean by direct method

What this assignment covers

Read grouped tables and calculate mean using efficient methods.

Skills and sections

Read grouped frequency distributions, Find class marks, Compute mean by direct method, Compute mean by assumed mean method, Choose an efficient mean method

  • Concept Check: 5 questions
  • Apply and Analyse: 5 questions