Question
Find the mean and standard deviation using short-cut method
60 | 61 | 62 | 63 | 64 | 65 | 66 | 67 | 68 | |
2 | 1 | 12 | 29 | 25 | 12 | 10 | 4 | 5 |
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Text solutionVerified
60 | 2 | -4 | 16 | -8 | 32 |
61 | 1 | -3 | 9 | -3 | 9 |
62 | 12 | -2 | 4 | -24 | 48 |
63 | 29 | -1 | 1 | -29 | 29 |
64 | 25 | 0 | 0 | 0 | 0 |
65 | 12 | 1 | 1 | 12 | 12 |
66 | 10 | 2 | 4 | 20 | 40 |
67 | 4 | 3 | 9 | 12 | 36 |
68 | 5 | 4 | 16 | 20 | 80 |
Total | 100 | 0 | 286 |
Let assumed mean
Variance
standard deviation
Mean
Variance
standard deviation
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For two data sets, each of size 5, the variances are given to be 4 and 5 and the corresponding means are given to be 2 and 4, respectively. The variance of the combined data set is Question 4
Thirty children were asked about the number of hours they watched TV programmes in the previous week. The results were found as follows:(i) Make a grouped frequency distribution table for this data, taking class width and one of the class intervals as .
(ii) How many children watched television for 15 or more hours a week?
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Question Text | Find the mean and standard deviation using short-cut method |
Answer Type | Text solution:1 |
Upvotes | 150 |