Question

The mean marks of 7 students are 55.the marks of 6 students are 52,54,55,53,56 and 54.find the marks of the seventh student.

Answer 1

Answer:I hope this help you.

Step-by-step explanation:

Answer 2

The marks of the seventh student is 61

Step-by-step explanation:

$Average = \frac{\text{Sum of all observations}}{\text{No. of observations}}$

The mean marks of 7 students are 55

The marks of 6 students are 52,54,55,53,56 ,54

Let the marks of seventh student be x

So, $55 = \frac{52+54+55+53+56+54+x}{7}$

$55 \times 7 = 52+54+55+53+56+54+x$

385=324+x

385-324=x

61=x

Hence the marks of the seventh student is 61

#Learn more:

The average marks of 27 students is 18. If the average

marks of first 13 students is 16 and that of last 13

students is 17, then find the marks of 14 student.

A. 55

B. 57

C. 54

D. None of these​

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