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Use shortcut method to find the mean of ...

Use shortcut method to find the mean of monthly wages of a certain number of workers:

Find the new mean, when:
the number of workers in each category is halved.

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Use short-cut method to find the mean of monthly wages of a certain number of workers:

use shortcut method to find the mean of monthly wages of a certain number of workers: Find the new mean, when: the number of workers in each category is doubled and the monthly wage in each category is decreased by 20%.

Use shortcut method to find the mean of monthly wages of a certain number of workers: Find the new mean, when: the monthly wage of each worker is increased by 30%,

From the data, give below, calculate the mean wage, correct to the nearest rupee. (i) If the number of workers in each category is doubled, what would be the new mean wage? (ii) If the wages per day in each category are increased by 60%. What is the new mean wage? (iii) If the number of workers in each category is doubled and the wages per day per worker are reduced by 40%, what would be the new mean wage?

Using direct method, find the mean of following frequency distribution:

The mean of a certain number of observations is 35. What is the new value of the mean if each observation is : divided by 5.

The mean income of a group of workers is bar(X) and that of another group is bar(Y) . If the number of workers in the second group is 10 times the number of workers in the first group, then the mean income of the combined group is

The mean of a certain number of observations is 35. What is the new value of the mean if each observation is : increased by 7.

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ICSE-REVISION PAPER -3 -SECTION - B
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  12. A straight line passes through the points A(-5, 2) and B(3,-6). It int...

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  13. A straight line passes through the points A(-5, 2) and B(3,6). It inte...

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  14. A straight line passes through the points A(-5, 2) and B(3,6). It inte...

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  15. If (7a + 8b)/( 7c + 8d) = (7a - 8b)/(7c - 8d), prove that : a:b= c:d

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