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Given the data set of 10 people as 5, 10, 25, 25, 40, 50, 60, 75, 100 and 120.
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In part a, we need to find mean.
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So mean will be sum of all these.
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25 plus 40 plus 50 plus 60 plus 75 plus 100 plus 120 whole divided by 10.
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So this is equal to 510 by 10.
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So that is equal to 51.
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Now in part b, we need to find the median.
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For median, these all are in ascending order only.
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So median will be equal to n by 2th observation plus n by 2th plus 1th observation whole divided by 2.
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Now n over here is 10, since there are 10 observations, so 10 plus 2, 5th observation plus 6th observation.
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So 5th observation is 1, 2, 3, 4, 5.
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40 and 6th is 50 divided by 2.
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So that is equal to 45.
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Next in part c, mode will be, since 25 is repeated 2 times, so mode will be 25.
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D range, range will be highest minus lowest value.
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So that is 120 minus 5, that is 115.
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And in part e, we need to find the standard deviation...