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The following table gives the distribution of normal annual rainfall in 100 places in Odisha. What is the normal annual rainfall in the state? Rainfall Class (in cm) No. of Places 70-90 10 90-110 20 110-130 40 130-150 20 150-170 10

The following table gives the distribution of normal annual rainfall in 100 places in Odisha. What is the normal annual rainfall in the state? Rainfall Class (in cm) No. of Places 70-90 10 90-110 20 110-130 40 130-150 20 150-170 10 Correct Answer 120 cm

Calculation:

Rainfall Class (in cm)

No. of Places

Mean Rainfall Class (in cm)

Mean Rainfall Class (in cm) × No. of Places

70-90

10

80

800

90-110

20

100

2000

110-130

40

120

4800

130-150

20

140

2800

150-170

10

160

1600

 

Sum = 100

 

Sum = 12000

 

∴ normal annual rainfall in the state = 12000/100 = 120 cm

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