Find the variance and standard deviation of the wages of 9 workers given below :
Rs. 310, Rs. 290, Rs. 320, Rs 280, Rs. 300, Rs. 290, Rs. 320, Rs. 310, Rs. 280.

Calculate Median of the data given below : daily wages of 6 workers are Rs 140,Rs.220, Rs 90, Rs. 170, Rs 140, Rs.200.

Find the arithmetic mean of the sales per day in a fair price shop in a week. Rs 1000, Rs 1250, Rs 1090, Rs 825, Rs 535, Rs 110.

If CP = Rs. 100 and loss = Rs. 20, then SP = Rs. 80.

Which of the following is a better investment ? (A) 10%, Rs. 100 shares at Rs. 120. (B) 9%, Rs. 100 shares at Rs. 110.

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

Find the value of x if 35% of Rs. x is Rs. 280