Thirty women were examined in a hospital by a doctor and the number of heartper minute were recorded and summarized as follows. Find the mean heart beats per minute for these women, choosing a suitable method.

100 surnames were randomly picked up from a local telephone directory and the frequency distribution of the number of letters in the English alphabets in the surnames was obtained as follows: Determine the median number of letters in the surnames. Find the mean number of letters in the surnames? Also, find the model size of the surnames.

A survey was conducted by a group of students as a part of their environment awareness programme, in which they collected the following data regarding the number of plants in 20 houses in a locality. Find the mean number of plants per house. Which method did you use for finding the mean, and why?

The power used by the human heart while beating 72 times per minute is given by one of the following if the average work done during one singal beat is 0.5 J.

In a retail market, fruit vendors were selling mangoes kept in packing boxes. These boxes contained varying number of mangoes. The following was the distribution of mangoes according to the number of boxes. Find teh mean number of mangoes kept in a packing box. Which method of finding the mean did you choose?