The double bar graph below shows the marks obtained by some students in two of their class tests. Find the average marks scored by the students in the first test.
A
55 marks
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B
60 marks
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C
70 marks
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D
75 marks
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Solution
The correct option is A 55 marks From the given double bar graph, the marks obtained by students in first test are 50, 45, 60, 65 and 55. Mean=Sum of observationsNumber of observations Therefore, the mean of the marks obtained in the first test is: Mean=50+45+60+65+555=55