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481. The frequency distribution of population in males in different age groups is given below:
Calculate the mean deviation about the median.

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482. Find the mean and variance for the following data:
25, 50, 45, 30, 70, 42, 36, 48, 34, 50

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483. Find the mean and variance for the following data:
6, 7, 10, 12, 13, 4, 8, 12

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484. Find the mean and variance of the first n natural numbers.

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485. Find the variance and standard deviation of 3, 5, 5, 4, 6, 3, 5, 7,1, 8.

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486. Find the variance and standard deviation of 62,65, 57, 62, 56, 51, 69, 60.

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487. Find the mean and variance for the following data:

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Since the values of x are large, we shall use deviations, method to find mean.
Let A = 90
The table is:

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489. Compute (a) the mean (b) the variance (c) the standard deviation of the following data:

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490. Calculate the mean and standard deviation for the following data:

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