Common Core HSS.ID.A.2 worksheet

Question 1

Shoe-shop sales by size: size 4: 4, size 5: 6, size 6: 8, size 7: 2, size 8: 2. What is the modal shoe size?

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Question 2

Find the variance of 17, 25, 23, 21, 19 (treat them as the whole population).

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Question 3

Set X: 27, 28, 29, 30, 31 Set Y: 19, 24, 29, 34, 39 Both have mean 29. Which set has the larger standard deviation?

• A. X
• B. Y
• C. They are equal

Question 4

Set A: 23, 24, 24, 25, 24. Set B: 16, 21, 24, 27, 32. Which set has the larger standard deviation?

• A. A
• B. B
• C. They are equal

Question 5

A set of test scores has standard deviation 5. The teacher adds 9 bonus points to every score. What is the new standard deviation?

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Question 6

Find the population standard deviation of: 7, 11, 7, 11

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Question 7

The table shows the number of pets per household: 0 pets: 2, 1 pets: 6, 2 pets: 5, 3 pets: 8, 4 pets: 1. Find the mean number of pets. Round to 2 decimal places.

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Question 8

Find the population standard deviation of 10, 14, 18, 12, 18, 8. Give 2 decimal places.

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Question 9

Shoe-shop sales by size: size 4: 2, size 5: 2, size 6: 8, size 7: 5, size 8: 2. What is the modal shoe size?

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Question 10

Find the variance of 17, 16, 18, 20, 19 (treat them as the whole population).

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Question 11

Set X: 25, 31, 37, 43, 49 Set Y: 31, 34, 37, 40, 43 Both have mean 37. Which set has the larger standard deviation?

• A. X
• B. Y
• C. They are equal

Question 12

Set A: 19, 20, 20, 21, 20. Set B: 12, 17, 20, 23, 28. Which set has the larger standard deviation?

• A. A
• B. B
• C. They are equal

Question 13

A set of test scores has standard deviation 14. The teacher adds 9 bonus points to every score. What is the new standard deviation?

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Question 14

Find the population standard deviation of: 3, 7

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Question 15

The table shows the number of pets per household: 0 pets: 7, 1 pets: 3, 2 pets: 3, 3 pets: 2, 4 pets: 8. Find the mean number of pets. Round to 2 decimal places.

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Question 16

Find the population standard deviation of 20, 11, 13, 12, 16, 3. Give 2 decimal places.

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