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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 |
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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 |
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