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Primary SchoolBusiness studies 10+5 pts


Find the missing frequency from the following data. (10)

Marks 0-10 10-20 20-30 30-40 40-50 50-60

No. of

students

15 25 30 - 30 20

Arithmetic mean of marks is 44.

Answer 1

HEY MATE,

let us take the missing number as $x$

$mean= \frac{sum of all observations }{total no. of observations}$

So, $44 = \frac{15+25+30+x+30+20}{6}$

      $44=\frac{120 +x}{6}$

      $44=20+x$

      $x=44-20$

 

       $x = 24$

 

Thus, the missing value is 24

     

Answer 2

let the missing number be x

44= 15 + 25 + 30 + X + 30 + 20/6
44 = 120 + X / 6
44 = 20 + x
x=44 - 20
x=24
so the missing number is 24