Question

In a class of 32 students the mean height of boys is 1.56 the mean height of all 32 students is 1.515 work out the mean of girls

Answer 1

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Step-by-step explanation:

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Answer 2

Answer:

The mean of 18 girls students is 1.48

Step-by-step explanation:

Given as :

Total number of students in class = 32

number of boys + number of girls = 32

The mean height of 32 students = 1.515

The mean height of 14 boys = 1.56

The mean height of girls = x

Let The number of boys = b

Let The number of girls = g

According to question

∵The mean height of students = 1.515

Total number of students = 32

So, Total height of 32 students = 32 × 1.515

i.e Total height of 32 students = 48.48

Again

As number of girls = g

So, g  = 32 - 14

i.e g = 18

∴ 14 × 1.56 + 18 × x  = 48.48

Or, 21.84 + 18 x = 48.48

Or, 18 x = 26.64

∴   x =$\dfrac{26.64}{18}$

i.e  x = 1.48

So, The mean of girls student = x = 1.48

Hence, The mean of 18 girls students is 1.48  Answer

The mean of 18 girls students is 1.48

Step-by-step explanation:

Given as :

Total number of students in class = 32

number of boys + number of girls = 32

The mean height of 32 students = 1.515

The mean height of 14 boys = 1.56

The mean height of girls = x

Let The number of boys = b

Let The number of girls = g

According to question

∵The mean height of students = 1.515

Total number of students = 32

So, Total height of 32 students = 32 × 1.515

i.e Total height of 32 students = 48.48

Again

As number of girls = g

So, g  = 32 - 14

i.e g = 18

∴ 14 × 1.56 + 18 × x  = 48.48

Or, 21.84 + 18 x = 48.48

Or, 18 x = 26.64

∴   x =$\dfrac{26.64}{18}$

i.e  x = 1.48

So, The mean of girls student = x = 1.48

Hence, The mean of 18 girls students is 1.48  Answer