Find the variance of 1, 2, 0, -3, 5, -2, 4.
527
407
327
277
Correct answer is A
Mean, ˉx=1+2+0+(−3)+5+(−2)+47=77=1
| x | (x−ˉx) | (x−ˉx)2 |
| 1 | 0 | 0 |
| 2 | 1 | 1 |
| 0 | -1 | 1 |
| -3 | -4 | 16 |
| 5 | 4 | 16 |
| -2 | -3 | 9 |
| 4 | 3 | 9 |
| Total (n) = 7 |
52 |
Variance = \frac{\sum (x - \bar{x)^{2}}{n}
= 527
In how many ways can 9 people be seated on a bench if only 3 places are available?
1200
504
320
204
Correct answer is B
No explanation has been provided for this answer.
5.7ms−1
6.0ms−1
60.0ms−1
77.5ms−1
Correct answer is A
s=ut+12at2
250=6u+12(12)(62)
250=6u+216⟹6u=250−216=34
u=346≊
For what values of m is 9y^{2} + my + 4 a perfect square?
\pm {2}
\pm {3}
\pm {6}
+12
Correct answer is D
No explanation has been provided for this answer.