Question

the height of the ten girls measured in cm and the results were as follow: 143, 148, 135, 150, 128, 139, 149, 146, 151, ,132.

a) find the mean ?
b) how many girls are there whose heights are less than the mean height?​

Answer 1

Answer:

a) 143+148+135+150+128+139+149+151+132

= 1421÷10

=142.1

b) there are 4 girls whose heights are less than mean.

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Answer 2

Answer:

• Mean height = 142.1 cm
• 4 Girls in the class have heights less than the mean height.

Explanation:

Given,

• Number of girls in the class, n = 10 girls
• Measured height in cm are as follows: 143, 148, 135, 150, 128, 139, 149, 146, 151, 132.

To find,

• Mean height =?
• Number of girls having height less than mean height =?

Formula required,

• Formula to calculate Mean (of ungrouped data)

    Mean = ( Sum of all observations ) / ( number of observations )

Solution,

Using formula to calculate mean

→ Mean height = ( sum of all measured height ) / ( total number of girls )

→ Mean height = ( 143 + 148 + 135 + 150 + 128 + 139 + 149 + 146 + 151 + 132 ) / ( 10 )

→ Mean height = 1421 / 10

→ Mean height = 142.1  cm

Therefore,

• Mean height is equal to 142.1 cm.

Since, there are 4 observation less than the mean value 142.1

therefore,

• There are 4 girls whose heights are less than the mean height.