Interactive Statistics Q. 4.31

4.31 A study was conducted to find out the number of hours children aged 8 to 12 years spent watching television. Out of all of the 100 households in a certain housing area identified as having children aged 8 to 12 years, 20 households were to be selected at random, and all children aged 8 to 12 years in the selected households were interviewed. The following histogram was obtained for all the children aged 8 to 12 years interviewed: 12 11 Count o 0-1 1-2 2-3 3-4 4-5 Number of hours watching TV (a) Assuming that all children interviewed are represented in the histogram, what is the total number of children interviewed? (b) What proportion of children spent less than two hours watching television