1.

The average of the numbers 16, 17.5, 18.25, x, 20, 19.5 and 21 is 19.25, what is the number x?1). 212). 21.253). 20.254). 23

Answer»

The given NUMBERS are 16, 17.5, 18.25, 20, 19.5, 21 and X

∴ Sum of all given numbers = 16 + 17.5 + 18.25 + 20 + 19.5 + 21 + x

⇒ Sum of all given numbers = 112.25 + x

We know that,

Average = (Sum of all observations)/(Number of observations)

∴ Sum of all observations = Average × Number of observations

? The average of given 7 numbers is 19.25

⇒ Sum of given 7 numbers = 19.25 × 7 = 134.75

⇒ 112.25 + x = 134.75

⇒ x = 134.75 – 112.25

⇒ x = 22.5


Discussion

No Comment Found