1. Form a grouped frequency table of intervals and histogram for 0 – 10, 10 – 20, 20 – 30 … from the following marks out of 50 obtained by group of students: 5, 23, 49, 50, 38, 37, 25, 30, 29, 42, 37, 18, 12, 13, 9, 18, 27, 32, 50, 47, 48, 29, 30, 32, 37, 27, 41, 19, 32, 27
2. Following is the electricity bill (in Rs) of 25 houses of a colony:
324, 718, 843, 312, 333, 508, 400, 499, 763, 375, 480, 435, 429, 700, 402, 780, 810, 898, 596, 813, 422,515, 565, 637, 674.
Draw the histogram for the data .
Answers
Given : marks out of 50 obtained by group of students: 5, 23, 49, 50, 38, 37, 25, 30, 29, 42, 37, 18, 12, 13, 9, 18, 27, 32, 50, 47, 48, 29, 30, 32, 37, 27, 41, 19, 32, 27
To find : Form a grouped frequency table of intervals and histogram for 0 – 10, 10 – 20, 20 – 30 and so on
Solution:
49, 50, 42, , 50, 47, 48, 41, ,
CI f
0 - 10 2
10 - 20 5
20 - 30 7
30 - 40 9
40 - 50 7
Histogram: a graphical display of data using bars of different heights. It is similar to a Bar Chart, but a histogram groups numbers into ranges
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