Question

average height of 40
students was calculated as 155cm it was later discovered that the height of one student was read as 157 instead of 137cm calculate the correct average weight​

Answer 1

Explanation:

no. of students=40

avg heights of 40 students=155cm

but height of one student was misread as 157cm

avg= (sum of obs/heights)/no. of students

let sum of heights of students be x

so, x/40=155

=> x=155×40=6200

but later it was discovered that the student's height was 137

:.now 157-137=20cm

new avg= (x-20)/40=155-20

=>x-20=5400

=>x=5420

now the sum of heights of students= 6200-5420=780