Question
The average of n numbers is 64. If each of 56% of
the numbers is increased by 15 and each of the remaining numbers is decreased by 10, then the new average of the numbers will beSolution
Average = 64 + ((56 x 15 - 44 x 10)/100) = 64 + 4 = 68
Stevenson screen is used along with an instrument for obtaining an accurate result. Which instrument?
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