Question

Find the mean of the following frequency distribution, using the
assumed-mean method:
Class
100-120
100-120 120-140
120-140 140-160 160-180 180-200
Frequency 10 20 30 15 5​

Answer 1

Answer:

ans is 147.5

Step-by-step explanation:

pls check the attachment.

Answer 2

Assumed mean is used to calculate the actual mean as well as the variance and standard deviation.

Mean,

=Let A=150 be the assumed

mean,then

We have,

= X=A+∑(fi×di) /∑fi

=150-300/80

=150-3.75

x=146.25