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Recent questions tagged measures-of-dispersion-(mean)

If the mean of $n$ observation $ 1^2, 2^2, 3^2.....n^2$ is $ \large\frac{46n}{11}$ then $n$ is equal to

asked Jan 30, 2014 by thanvigandhi_1

1 answer

If the mean deviation of the numbers $ 1, 1+d, 1+2d......1+100d$ from their mean is $255$, then the $d$ is equal to

asked Jan 29, 2014 by thanvigandhi_1

1 answer

Combined mean of two series $x_1\: and \: x_2$ when \[\] $x_1 = 210,\: x_2 = 150, \: n_1=50, \: n_2=100 $ is

asked Jan 28, 2014 by thanvigandhi_1

1 answer

A group of 10 items has arithmatic mean 6. If the arithmatic mean of 4 of these remaining item is 7.5 then the mean of the remaining item is

asked Jan 27, 2014 by thanvigandhi_1

1 answer

In a class of 100 students there are 70 boys whose average marks in a subject are 75. If the average marks of the complete class is 72 then what is the average of the girls ?

asked Jan 26, 2014 by thanvigandhi_1

1 answer

The mean age of a combined group of men and women is 30 years. If the mean of the age of men and women are respectively 32 and 27, then the percentage of women in the group is

asked Jan 26, 2014 by thanvigandhi_1

1 answer

A group of 10 items has mean 6. If mean of 4 of these items is 7.5 the mean of remaining items is

asked Jan 26, 2014 by thanvigandhi_1

1 answer

The mean of a set of observation is $ \overline x$. If each observation is divided by $ a, a \neq 0$ and then is increased by 10, then mean of the new set is

asked Jan 26, 2014 by thanvigandhi_1

1 answer

Mean of 100 items is 49. It was discovered that 3 items 60, 70, 80 were wrongly read as 38,22,50 respectively. The correct mean is

asked Jan 25, 2014 by thanvigandhi_1

1 answer

A car owner buys petrol at Rs. 7.50 Rs. 8.00 and Rs. 8.50 per litre for the 3 successive years. If he spends Rs. 4000 each year, then the average cost per litre of petrol is

asked Jan 25, 2014 by thanvigandhi_1

1 answer

The weighted mean of first $n$ natural numbers whose weights are equal to the squares of the corresponding numbers is

asked Jan 25, 2014 by thanvigandhi_1

1 answer

If the mean of the set of numbers $ x_1, x_2.....x_n$ is $ \overline x$ then mean of the numbers $ x_i+2i \: \: 1 \leq i \leq n $ is

asked Jan 25, 2014 by thanvigandhi_1

1 answer

The average salary of male employees in a factory was Rs. 520 and that of females was Rs. 420. If mean salary of all employees is Rs. 500, the % of male employees is?

asked Jan 25, 2014 by thanvigandhi_1

1 answer

Mean of 10 items was found to be 15. On verification it was found that an item 21 was miscopied as 12. Find the correct mean.

asked Jan 25, 2014 by thanvigandhi_1

1 answer

Find the mean of first $n$ odd natural numbers.

asked Jan 24, 2014 by thanvigandhi_1

1 answer

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