Construct a frequency table for the following weights (in gm) of 35 mangoes using the equal class intervals, one of them is 40-45 (45 not included) :
30, 40, 45, 32, 43, 50, 55, 62, 70, 70, 61, 62, 53, 52, 50, 42, 35, 37, 53, 55, 65, 70, 73, 74, 45, 46, 58, 59, 60, 62, 74, 34, 35, 70, 68.
(i) What is the class mark of the class interval 40-45?
(ii) What is the range of the above weights?
(iii) How many classes are there?
Weight (in gram) | No.of mangoes |
30 – 35 | 4 |
35 – 40 | 1 |
40 – 45 | 3 |
45 – 50 | 3 |
50 – 55 | 7 |
55 – 60 | 3 |
60 – 65 | 6 |
65 – 70 | 5 |
70 – 75 | 3 |
(i) Class mark of class interval 40 – 45 =
(ii) Range of the weights = 74 – 30 = 44.
(iii) Number of classes = 9.