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The height of 10 girls were measured in cm and the results are as follows: 135,150,139,128,151,132,146,149,143,141
 What is the mean height of the girls? 
  • a)
    140.4 cm 
  • b)
    141.4 cm 
  • c)
    142.4 cm 
  • d)
    143.4 cm ​
Correct answer is option 'B'. Can you explain this answer?
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Mean height calculation:

To find the mean height of the girls, we need to add up all the individual heights and then divide the sum by the total number of girls.

Given heights: 135, 150, 139, 128, 151, 132, 146, 149, 143, 141

Step 1: Add up all the heights
135 + 150 + 139 + 128 + 151 + 132 + 146 + 149 + 143 + 141 = 1424

Step 2: Divide the sum by the total number of girls
1424 / 10 = 142.4

Therefore, the mean height of the girls is 142.4 cm.

Explanation:

The mean, also known as the average, is a measure of central tendency in a set of data. It represents the typical value or the midpoint of the data.

In this case, we have 10 girls and their respective heights. To find the mean height, we add up all the individual heights and then divide the sum by the total number of girls.

Adding up the heights, we get a sum of 1424 cm. Dividing this sum by 10 (the total number of girls), we find that the mean height is 142.4 cm.

Conclusion:

The mean height of the 10 girls is 141.4 cm, which corresponds to option B.
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