Question

Question :

Determine the missing frequency x of the following frequency distribution , if mode is 67

Class | Frequency

40 - 50 | 5

50 - 60 | x

60 - 70 | 15

70 - 80 | 12

80 - 90 | 7

Answer 1

Answer:

x = 8

Step-by-step explanation:

Mode = I + f1−f0/2f1−f2−f0 x h

67 = 60 + (15−x/30−12−x)*10

7 = 15−x/18−x*10

7x(18 - x) = 10(15 - x)

126 - 7x = 150 - 10x

3x = 150 - 126  

3x = 24

 x = 8

Answer 2

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