For a group of 50 male workers, the mean and the standard deviation of their daily wages are Rs. 630 and Rs. 90 respectively and for a group of 40 female workers these are Rs. 540, and Rs . 60 respectively. Then, the standard deviation of all these 90 workers is

For a group of 50 male workers, the mean and standard deviations of their daily wages are ₹ 63 and ₹ 9 respectively for a group of 40 female workers, these are ₹ 54 and ₹ 6 respectively. Find the mean and standard deviation for the combined group.

For a group of 100 students, the mean bar(x)_(1) and the standard deviation sigma_(1) of their marks were found to be 40 and 15 respectively. Later it was observed that the scores 40 and 50 were misread as 30 and 60 respectively. If the mean and the standard deviation with the corrected observations of the scores, are bar(x)_(2) and sigma_(2) respectively , then

For a group of 100 candidatges the mean and standard deviation of their marks were found to be 60 and 15 respectively. Later on it was found that the scores 45 and 72 were wrongly entered as 40 and 27. Find the correct means and standard deviation.

The mean and S.D. of income of 50 men are Rs. 3200 and Rs. 525 respectively. The same for 40 women are Rs. 2,850 and Rs. 460 respectively. Find the S.D. of income for the combined group.

In an industrial establishment, the coefficients of variation of wages of male and female workers were 55% and 70% respectively. The standard deviations were Rs. 22 and Rs. 15.40 respectively. Calculate the combined average wages for all workers if 80% of the workers were male.

The average salaries of the male and the female workers in a factory are Rs.5200 and Rs.4200 respectively.If the average salary of all of the workers is Rs.5000,then find the percentages of the male and female workers in the factory.

Calculate the mean and standard deviation for the following data: Wages upto (into Rs.) 15 30 45 60 75 90 105 120 No. of workers 12 30 65 107 157 202 222 230

Calculate the mean and standard deviation for the following data: Wages upto (into Rs.) 15 30 45 60 75 90 105 120 No. of workers 12 30 65 107 157 202 222 230

Wages (in Rs) obtained by workers is a