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61. Find the median of first ten prime numbers.

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62. The mean of 10, 12, 18, 13, x and 17 is 15. Find the value of x.

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63.

Find the mean of the following distribution:

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First 10 multiples of 7 are
7, 14, 21, 28, 35, 42, 49, 56, 63, 70
Their mean

equals fraction numerator 7 plus 14 plus 21 plus 28 plus 35 plus 42 plus 49 plus 56 plus 63 plus 70 over denominator 10 end fraction equals 385 over 10 equals 38.5

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65. Arithmetic mean of terms 21, 16, 24, x, 29, 15 is 23. Find the value of x.

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66.

Find the mean of the following distribution:

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67.

In the distribution, the frequency of the class 3-5 is

4, 8, 3, 6, 7, 2, 3, 5, 9, 4, 6, 5, 5.

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68.

The range of the following frequency distribution is

2.7, 2.7, 2.8, 2.1, 2.4, 3.2, 2.1, 3.1, 2.8, 3.2.

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69. If the range of a distribution is 50 and class interval is 10. Then, the number of classes is

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70.

In the distribution, the frequency of the class 0–5 is

0, 3, 2, 5, 8, 10, 13, 5, 6, 6, 14, 0.

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