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EXERCISE 16.1, , 1. The marks scored by 11 students in Mathematics test are as follows:, 34, 37, 30, 38, 50, 34, 34, 38. 36, 45, 31, Find the value of; (a) range (b) arithmetic mean (c) median (d) mode, 2. The rainfall in (mm) ina city on 7 days of a certain week is recorded as follows:, , MEIN Monday | Tuosday | Wednesday | Thursday, BOM 35 ez) on fons es, , (a) Find the range of the amount of rainfall from the above data., , (b) Find the mean rainfall for the week., , (c) For how many days was the rainfall more than the average?, 3. The weight (in kg) of 15 students of a class are:, , 39, 42, 33, 45, 36, 47, 35, 44, 49, 40, 37, 39, 44, 39, 44, , (a) Find the median weight., , (b) Find the value of mode. Is there more than one mode?, 4. Samuel who works in a customer care call centre keeps a record of the number of minutes, , each telephone call lasts. The record of the calls is:, , 10, 25, 31, 31, 19, 13, 26, 26, 19, 10, 13, 20, 26, 19, 26, 19, 26, 30, 28, 26, , (a) Convert the data into frequency table., , (b) How many minutes does the longest and shortest call last? Also calculate the range., , (c) Calculate the mean, median and mode., , (d) The customer care call centre wants to know the central tendency which best describes, the situation and is useful in estimating the total time the employees are at work. Can, you help?