Question

Find the mean of the following frequency distribution :
(Value of the variable - Frequency)
11 - 26
12 - 28
13 - 18
14 - 19
15 -22
16 - 25
17 - 30
18 - 32
19 - 40
20 - 45

Answer 1

Answer:

15.5

Step-by-step explanation:

=11+12+13+14+15+16+17+18+19+20/10=15.5

plz follow me.....

Answer 2

Answer:

Step-by-step explanation:

The summation of the frequency will be 26+28+18+19+22+25+30+32+40+45= 285.

Now, the value of fixi will be 26*11= 286, 28*12=336, 18*13=234, 19*14=266, 22*15=330, 25*16=400, 30*17=510, 32*18=576, 40*19=760, 45*20=900.

So, the summation of fixi will be 286+336+234+266+330+400+510+576+

760+900=4598.

Then, the mean value will be 4598/285= approximately 16.