A grouped frequency table of 50 readings has classes 0-10, 10-20, 20-30, 30-40, 40-50 with frequencies 5, a, 14, b, 7. The frequency of the class 10-20 is twice that of the class 30-40. Find the frequency a of the class 10-20.

Question

Accepted Answer

16. Total = 50, so 5 + a + 14 + b + 7 = 50, giving a + b = 24. Since a = 2b, we get 2b + b = 24, so 3b = 24, b = 8 and a = 2b = 16.

A grouped frequency table of 50 readings has classes 0-10, 10-20, 20-30, 30-40, 40-50 with frequencies 5, a, 14, b, 7. The frequency of the class 10-20 is twice that of the class 30-40.
Find the frequency a of the class 10-20.

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More Class 8 Organising Data practice

A grouped frequency table of 50 readings has classes 0-10, 10-20, 20-30, 30-40, 40-50 with frequencies 5, a, 14, b, 7. The frequency of the class 10-20 is twice that of the class 30-40.Find the frequency a of the class 10-20.

Step-by-Step Solution

Master this chapter in 30 minutes a day.

More Class 8 Organising Data practice

A grouped frequency table of 50 readings has classes 0-10, 10-20, 20-30, 30-40, 40-50 with frequencies 5, a, 14, b, 7. The frequency of the class 10-20 is twice that of the class 30-40.
Find the frequency a of the class 10-20.