The variance of $20$ observations is $5$. If each of the observations is multiplied by $2$,then the variance of the resulting observations is:
- A$40$
- B$80$
- C$20$
- D$10$
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Let $n$ observations $x_1, x_2, ....., x_n$ be such that $\sum {x_i}^2 = 400$ and $\sum x_i = 80$. Then,which of the following is a possible value for $n$?
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Find the mean and variance for the first $n$ natural numbers.
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Class $0-10$ $10-20$ $20-30$ $30-40$ Frequency $1$ $3$ $4$ $2$
| Class | $0-10$ | $10-20$ | $20-30$ | $30-40$ |
| Frequency | $1$ | $3$ | $4$ | $2$ |
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