Question

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

Answer 1

Answer:

Step-by-step explanation:

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

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Answer 2

Answer:

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