Question 129

Study the given graph and answer the question that follows.

If 60% of the total number of students obtaining 50 marks or more but less than 70 marks are girls and 55% of the total number of students obtaining 70 marks or more but less than 90 marks are also girls, then the total number of girls obtaining 50 marks or more but less than 90 marks is:

Solution

From the given DI 50-60 = 150 and 60-70 = 120

then total student = 150 + 120 = 270

according to question girls =$$270 \times .60 = 162 $$

again range 70 -80 = 100 student and 80-90 = 80 student

then total student = 100 + 180 = 180

according to question girls = $$ 180 \times 0.55 = 99 $$

so total girls = 162 + 99 = 261 Ans

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