Practice - Application to Grouped Data
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Practice Questions
Test your understanding with targeted questions
What is the midpoint of the class interval 20-30?
💡 Hint: Add the lower and upper limits and divide by 2.
If a class has a frequency of 4 and a midpoint of 15, what is fx?
💡 Hint: Multiply frequency by midpoint.
4 more questions available
Interactive Quizzes
Quick quizzes to reinforce your learning
What is the formula for calculating the mean of grouped data?
💡 Hint: Think about the values we are summing and dividing by.
True or False: The standard deviation can be negative.
💡 Hint: What does standard deviation represent?
1 more question available
Challenge Problems
Push your limits with advanced challenges
A fruit vendor records the weights of bags: 1-3 kg (5), 3-5 kg (10), 5-7 kg (15). Determine the mean and standard deviation of the weights.
💡 Hint: Follow through with midpoints and properly calculate deviations.
In a survey, ages are grouped as follows: 0-20 (4), 21-40 (6), 41-60 (10). Find the variance of the ages.
💡 Hint: Don't forget to use midpoints and find squared differences.
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