Question

(b) Mean weight of 29 students is 50 kg.
Ifweight of teacher is included, the mean wt. is 51 kg.
Find the weight of theteacher.
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Answer 1

Answer:

Total weight of 24 students =24×35=840kg

Total weight of 25 persons with teacher =25×35.4=885kg.

∴ Weight of teacher =(885−840)kg=45kg.

Answer 2

Given:

Mean weight of 29 students is 50 kg

Ifweight of teacher is included, the mean wt. is 51 kg.

Need to find:

weight of the teacher.

calculation:

x¹+x²+....+x²⁹ =50 -------1

29

let weight of teacher be x³⁰ then

x¹+x²+x³+......+x³⁰=51 ------2

30

we know that

x¹+x²+....+x²⁹ =50 so from this x¹+x²+....+x²⁹=29*50

29

sub it in x¹+x²+x³+.....+x³⁰=51*30

we need x³⁰ so x³⁰ = 1530-(x¹+x²+...+x²⁹) but we know that x¹+x²+....+x²⁹=29*50

then x³⁰=1530 - 1450 => x³⁰=80kgs

HOPE YOU UNDERSTAND THE ANSWER