Sol:
|
X |
X - mean |
(X-mean)2 |
X2 |
| 88 |
-47.0526 |
2213.95014 |
7744 |
| 104 |
-31.0526 |
964.265928 |
10816 |
|
130 |
-5.05263 |
25.5290859 |
16900 |
| 160 |
24.94737 |
622.371191 |
25600 |
| 180 |
44.94737 |
2020.26593 |
32400 |
| 195 |
59.94737 |
3593.68698 |
38025 |
| 132 |
-3.05263 |
9.31855956 |
17424 |
| 145 |
9.947368 |
98.9501385 |
21025 |
| 213 |
77.94737 |
6075.79224 |
45369 |
| 105 |
-30.0526 |
903.160665 |
11025 |
| 145 |
9.947368 |
98.9501385 |
21025 |
| 151 |
15.94737 |
254.31856 |
22801 |
| 153 |
17.94737 |
322.108033 |
23409 |
| 136 |
0.947368 |
0.89750693 |
18496 |
| 87 |
-48.0526 |
2309.0554 |
7569 |
| 99 |
-36.0526 |
1299.79224 |
9801 |
| 95 |
-40.0526 |
1604.2133 |
9025 |
| 119 |
-16.0526 |
257.686981 |
14161 |
| 129 |
-6.05263 |
36.634349 |
16641 |
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2566 |
-2.8E-14 |
22710.9474 |
369256 |
s^2=sample variance=22710.9474/19-1=1261.719
min^2
s=sample standard deviation=sqrt(1261.719)=35.521
min
Solutionb:
1 hour=60 min
1min=1/60 hr
s^2=sample variance=22710.9474/19-1=1261.719 min^2=1261.719
(1/60 )^2hr^2=0.3504775=0.350 hour^2
s=sample standard deviation=sqrt(1261.719)=35.521
min=35.521/60=0.5920167 hour=0.592 hour
