Question

If the class mark is 25 and class width is 10 ,then
find the class

Answer 1

Answer:

20 - 30

Step-by-step explanation:

Let Lower Limit be L

∴ Upper Limit = L + 10      [∵ Class Width = 10 given]

Now, we know that

Class Mark = (Lower Limit + Upper Limit) ÷ 2

∴ (L + L + 10) ÷ 2 = 25           [Class Mark 25 given]

2L + 10 = 50

2L = 40

L = 20

∴ Lower Limit of the class = 20

Upper Limit of the class = 20 + 10 = 30

Hence, Desired Class is 20 - 30

Answer 2

Answer:

20-30

Step-by-step explanation:

let lower limit be L

:. upper limit=L+10……[class mark=25 given]

Now

class mark=o(lower limit+upper limit)÷2

:. (L+L+10)÷2=25……(class mark=25 given)

2L+10=50

2L=50-10

:. 2L=40

L=40/2

L=20

:. lower limit of the class = 20

upper limit of the class =20+10=30

hence,Desired class is 20-30.

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