Question

find the mean for the following data
CI. f
1-3. 7
3-5. 8
5-7. 2
7-9. 2
9-11. 1​

Answer 1

Answer:

Xi fi xifi

2 7 14

4 8 24

6 2 12

8 2 16

10 1 10

total= 30 20 76

Here,

Sum of fi =20

Sum of xi =30

Sum of Xifi =76

Now,

Mean=sum of xifi/sum of fi

=76/20

=33/10

=3.3

Therefore,the mean is 3.3