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20 लड़कों में, 6 लड़कों की लम्बाई 1m, 15m, 8 की लम्बाई 1m, 10cm तथा बचे लड़कों की लम्बाई 1m, 12cm है । सभी लड़कों की औसत लम्बाई ज्ञात करे?

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20 लड़कों में, 6 लड़कों की लम्बाई 1m, 15m, 8 की लम्बाई 1m, 10cm तथा बचे लड़कों की लम्बाई 1m, 12cm है । सभी लड़कों की औसत लम्बाई ज्ञात करे?
A. 1 m 12.1 cm
B. 1 m 21.1 cm
C. 1m 21 cm
D. 1 m 12 cm
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Correct Answer - A
According to the question
Height of 6 persons = 6 x 1m 15cm =6m 90 cm
Height of 8 persons =8 x 1m 10cm =8m 80 cm
Height of 6 persons = 6 x 1 m 12 cm =6 m 72 cm
Total Height of 20 person =22m 42cm
Averge =`(22 m 42 cm)/20`
=1 m 12.1 cm
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