The price increases on 5 stocks were $7, $8, $4, $1 and $5. The standard deviation...
The price increases on 5 stocks were $7, $8, $4, $1 and $5. The standard deviation for these price increases is
a. 2.3
b. 2.7
c. 3.2
d. 4.1
Homework Answers
Correct option:
b. 2.7
EXPLANATION:
Mean (
) is given
by:
| x | x - |
(x - )2 |
| 7 | 2 | 4 |
| 8 | 3 | 9 |
| 4 | - 1 | 1 |
| 1 | - 4 | 16 |
| 5 | 0 | 0 |
| Total = | 30 |
Variance (s2) is given by:
Standard deviation =s = 
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