New Zealand
Level 7 - NCEA Level 2
Standard Deviation
Interactive practice questions
Find the following based on this set of scores:
$19,18,14,19,10$19,18,14,19,10
a
Find the mean.
b
Complete the following table.
| Score($x$x) | $(x-$(x−mean$)$) | $(x-$(x−mean$)^2$)2 |
|---|---|---|
| $19$19 | $\editable{}$ | $\editable{}$ |
| $18$18 | $\editable{}$ | $\editable{}$ |
| $14$14 | $\editable{}$ | $\editable{}$ |
| $19$19 | $\editable{}$ | $\editable{}$ |
| $10$10 | $\editable{}$ | $\editable{}$ |
c
Thus, find the standard deviation, correct to 2 decimal places.
d
Find the range of the set of scores.
Easy
6min
Consider the set of scores below:
$12,21,-9,-18,49$12,21,−9,−18,49
Easy
4min
Find the population standard deviation of the following set of scores, to two decimal places, by using the statistics mode on the calculator:
$8,20,9,9,8,19,9,18,5,10$8,20,9,9,8,19,9,18,5,10
Easy
1min
Find the population standard deviation of the following set of scores correct to two decimal places by using the statistics mode on the calculator:
$-17,2,-6,9,-17,-9,3,8,5$−17,2,−6,9,−17,−9,3,8,5
Easy
1min
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