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Statistics

Short Answer Type

181. The mean of five numbers is 27. If one number is excluded, their mean is 25. Find the excluded number.

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182.

Find the mean of the following distribution:

x	f
4	5
6	10
9	10
10	7
15	8

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183.

If the mean of the following data is 15, find p:

x	f
5	6
10	P
15	6
20	10
25	5

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184. The mean of 10 numbers is 50. If one more number is ordered, then the mean is 50 itself. Find the added number.

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185. 10 numbers 8, 11, 15, 19, x + 1, 2x –13, 28, 31, 40, 41 are written in ascending order. If the median is 24, find x.

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186. Mean of 50 observations was found to be 80.4. But later on it was discovered that 96 was misread as 69 at one place. Find the correct mean.

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187.
Find the mode of the following data:

1, 3, 5 , 7, 3,

5, 4, 7, 2, 6,

7, 12, 10, 11, 3,

7, 8, 6, 7, 7,

4, 2, 11, 7, 15

Solution not provided.

Ans. 7

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188. The mean of 20 observations is 50. If the observation 50 is replaced by 140, what will be the new mean of the observations?

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189.

Find the median of the following data:

18, 37, 24, 59, 41, 56, 63, 45, 57, 29

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190. The mean age of 10 students of a class is 15 years. A student of age 14 years leaves the class and in his place age of their teacher is counted. Thus the mean age of group increased to 16. Find the age of the teacher.

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Previous Year Papers

Test Series

Test Yourself

Short Answer Type

187. Find the mode of the following data: 1, 3, 5 , 7, 3, 5, 4, 7, 2, 6, 7, 12, 10, 11, 3, 7, 8, 6, 7, 7, 4, 2, 11, 7, 15

187.
Find the mode of the following data:

1, 3, 5 , 7, 3,

5, 4, 7, 2, 6,

7, 12, 10, 11, 3,

7, 8, 6, 7, 7,

4, 2, 11, 7, 15