Question

If the class mark is 10 and class width is 4. Find the class.​

Answer 1

Answer:

Let the upper class limit be x and the lower class limit be y. Class mark = 10 …[Given] Class-mark = (Lower class limit + Upper class limit)/2 ∴ 10 = (x + y)/2 ∴ x + y = 20 …(i) Class width = 6 … [Given] Class width = Upper class limit – Lower class limit ∴ x – y = 6 …(ii) Adding equations (i) and (ii), x + y = 20 x – y = 6 2x = 26 ∴ x = 13 Substituting x = 13 in equation (i), 13 + y = 20 ∴ y = 20 – 13 ∴ y = 7 ∴