Question

30f1+70f2=4020 find f1 and f2.and f1+f2=82
​

Answer 1

Answer:

The value of f1 and f2 are 28 and 24.

Solution:

The sum of the frequency is equal to 120, so the sum be 17+f1+32+f2+19 = 120,

which means the sum of f1+f2 = 120 – 68  

f1 + f2 = 52.  

Now for the mean of the frequency we can say that   that means

The sum of is equal to  

50

we get the another equation for f1 and f2 i.e. 2520=30f1+70f2

Now equating 2520=30 f1+70 f2 and f1 + f2 = 52.

We get the value of f1 as 28 and f2 as 24.

Therefore, the value of f1 and f2 is equal to 28 and 24 respectively.