Question

calculate arithmetic mean of the following data
marks less than
80,70,60,50,40,30,20,10
no of students
100,90,80,60,32,20,13,5​

Answer 1

45 , 50

Step-by-step explanation:

$\large\bf\red{Arithmetic\;mean}$

Arithmetic mean or mean is a average of data of sum of all numbers in data divide by total number of data.

Arithmetic mean = (a1 + a2 + a3 + ... + an)/n

Arithmetic mean = 80+70+60+50+40+30+20+10/8

Arithmetic mean = 360/8

Arithmetic mean = 45

$\large\bf\red{Arithmetic\;mean=45}$

In the Second data,

No. of students (data)100,90,80,60,32,20,13,5

Arithmetic mean = (a1 + a2 + a3 + ... + an)/n

Arithmetic mean = 100+90+80+60+32+20+13+5/8

Arithmetic mean = 400/8

Arithmetic mean = 50

$\large\bf\red{Arithmetic\;mean=50}$