5 people were asked about the time in a week they spend in doing social work in their community. They said 10, 7, 13, 20 and 15 hours, respectively. Find the mean (or average) time in a week devoted by them for social work.

5 people of a locality were asked about the time they spent in a week in doing social work. They told the number of hous as: x,x+3,x+6,x+7,x+4. find the mean number of devoted by first three members. If mean number of hours of 5 persons is 11 hours, what values do we draw from above data?

Thirty children were asked about the number of hours they watched TV programmes in the previous week. The results were found as follows : : Make a frequency distribution table for this data, taking class width 5 and one of the class interval as 5— 10

In a primary school, the parents were asked about the number of hours they spent per day in helping their. Children to do home work. There were 90 parents who helped for (1)/(2) hour to 1(1)/(2) hours. The distribution of parents according to the time for which, they said they helped is given in the figure below : 20% helped for more than 1 ""1//2 hours per day, 30% helped for (1)/(2)" hour to "1 (1)/(2) hours, 50% did not help at all. Using this, answer the following: How many said that they helped for more than 1 (1)/(2) hours?

In a primary school, the parents were asked about the number of hours they spent per day in helping their. Children to do homw work. There were 90 parents who helped for (1)/(2) hour to 1(1)/(2) hours. The distribution of parents according to the time for which, they said they helped is given in the figure below : 20% helped for more than 1 ""1//2 hours per day, 30% helped for (1)/(2)" hour to "1 (1)/(2) hours, 50% did not help at all. Using this, answer the following: How many said that they did not help?

In a primary school, the parents were asked about the number of hours they spent per day in helping their. Children to do homw work. There were 90 parents who helped for (1)/(2) hour to 1(1)/(2) hours. The distribution of parents according to the time for which, they said they helped is given in the figure below : 20% helped for more than 1 ""1//2 hours per day, 30% helped for (1)/(2)" hour to "1 (1)/(2) hours, 50% did not help at all. Using this, answer the following: How many parents were surveyed?