Question : Given below is the observed data on the age of various boys. Study the table carefully and answer the question that follows.
| Age in years | Number of children (Boys) |
| 5 | 8 |
| 6 | 3 |
| 7 | 7 |
| 8 | 2 |
| 9 | 20 |
Calculate the mean age of the boys.
Option 1: 6.57
Option 2: 9.57
Option 3: 7.57
Option 4: 8.57
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Correct Answer: 7.57
Solution :
Mean Age
= $\frac{\text{Sum of ages of all children}}{\text{Number of children}}$
= $\frac{8\times 5+3\times6+7\times 7+8\times 2+20\times 9}{8+3+7+2+20}$
= $7.57$
Hence, the correct answer is 7.57.
Related Questions
Question : Directions: Find the missing number from the given responses.
| 6 | 7 | 4 |
| 5 | 3 | 5 |
| 7 | ? | 6 |
| 3 | 3 | 6 |
Option 1: 7
Option 2: 3
Option 3: 8
Option 4: 5
Question : Directions: Find the missing number from the given responses.
| 5 | 7 | 9 |
| 4 | 8 | 2 |
| 8 | 6 | ? |
| 160 | 336 | 108 |
Option 1: 4
Option 2: 7
Option 3: 6
Option 4: 8
Question : The following table shows the number of children in each house of a society.
| Number of Children | Number of Houses |
| 0 | 4 |
| 1 | 10 |
| 2 | 19 |
| 3 | 3 |
What is the average number of children per house?
Option 1: 1.58
Option 2: 1.83
Option 3: 2.08
Option 4: 1.33
Question : Directions: Find the missing number.
| 3 | 4 | 64 |
| 2 | 3 | 9 |
| 3 | 2 | 8 |
| 9 | 2 | ? |
Option 1: 216
Option 2: 512
Option 3: 128
Option 4: 1024
Question : Directions: Select the missing number from the given responses.
| 6 | 5 | 26 |
| 4 | 7 | 32 |
| ? | 9 | 44 |
Option 1: 8
Option 2: 31
Option 3: 32
Option 4: 36
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