InterviewSolution
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Out of 10 boys, 4 boys of 1 m 40 cm height, 3 are of 1 m 62 cm height and rest are of 1 m 73 cm height. What is the average height of all boys. 1. 156 cm2. 158 cm3. 156.5 cm 4. 155.5 cm |
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Answer» Correct Answer - Option 3 : 156.5 cm Given: Total numbers of boys = 10 Height of 4 boys = 1 m 40 cm = 140 cm Height of 3 boys = 1 m 62 cm = 162 cm Height of rest boys = 1 m 73 cm = 173 cm Formula used : Average = (sum of total observations)/(total numbers of observations) Calculation: Total numbers of boys = 10 Numbers of rest boys = 10 – 4 – 3 = 3 boys Sum of height first 4 boys = 4 × 140 cm ⇒ Sum of height first 4 boys = 560 cm Sum of height 3 boys = 3 × 162 cm ⇒ Sum of height 3 boys = 486 cm Sum of height rest 3 boys = 3 × 173 cm ⇒ Sum of height rest 3 boys = 519 cm Total height of 10 boys = (560 + 486 + 519) cm ⇒ Total height of 10 boys = 1565 cm Average = (sum of total observations)/(total numbers of observations) ⇒ Average of height of 10 boys = (1565)/10 ⇒ Average of height of 10 boys = 156.5 ∴ Average of height of all boys is 156.5. |
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