Measure of central tendency & dispersion – Test 3

Ram purchase 20kg. of rice and 2kg. of ghee every month. if the price of wheat is rs 10 per kg., price of rice is rs 14per kg. and price of ghee is rs 120 per kg. Find the average price per kg. per month. Arithmetic mean =?

The average rainfall for a week, excluding sunday, was 10cms. Due to heavy rainfall on sunday, the average for the week rose to 15 cms. How much rainfall was on sunday?

The mean weight of 20 employees in a company is 65kg. And the mean weight of 8 employees is 70kg. and another 7 is 55kg. you are required to find out the mean weight of remainder.

The mean weight of 98 students is found to be 50 Ibs. it is later discovered that the frequency of the class interval (30-40) was wrongly taken as 8 instead of 10. Calculate the correct mean.

The average marks of three batches of students having 70,50 and 30 students respectively are 50, 55 and 45. Find the average marks of all the 150 students, taken together.

The mean weight of 98 students is found to be 50 Ibs. It is later discovered that the frequency of the class interval (30-40) was wrongly taken as 8 instead of 10. Calculate the correct mean.

The average marks of three batches of students having 70, 50 and 30 students respectively are 50, 55 and 45. Find the average marks of all the 150 students, taken together.

The mean salary for a group of 40 females workers is Rs 5,200 per month and that of for a group of 60 male workers is Rs 6,800 per month. What is the combined salary?

Find median of the given observation: 25, 14, 28, 30, 25, 15, 32.

Find median of the given observation: 35, 20, 55, 27, 15, 40.

What is the median for the following observations? 5, 8, 6, 9, 11, 4.

2, 5, 8, 4, 9, 6, 7. What is the median for the following observation?

In a moderately a symmetrical distribution- The mode and median are 75 and 60 respectively, find mean.

In a moderately a symmetrical distribution- The mean and mode are 50 and 37.5 respectively, find median.

What is the modal value for the numbers 5, 8, 6, 4, 10, 15, 18, 10?

The standard deviation of 10, 16, 10, 16, 10, 10, 16, 16 is-

Find the mean and standard deviation of the following observations: X=2, 5, 7, 8, 13

The mean and standard deviation of 10 observations are 35 and 2 respectively. Find the changed mean and standard deviation if each observation is increased by 4.

The mean and standard deviation of 10 observations are 35 and 2 respectively. Find the changed mean and standard deviation if each observation is multiplied by 5.

If all the observations are increased by 10, then-

If all the observations are multiplied by 2, then

What is the SD of 5, 5, 9, 9, 9, 10, 5, 10, 10?

What is the coefficient of variation of the following numbers? 53, 52, 61, 60, 64.

Extreme values have ___ effect on mode.

Simple average may be called as-