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If 69.5 is the Mean of 72, 70, ‘X’, 62, 50, 71, 90, 64, 58 and 82, Find the Value of ‘X’. - ICSE Class 10 - Mathematics

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Question

If 69.5 is the mean of 72, 70, ‘x’, 62, 50, 71, 90, 64, 58 and 82, find the value of ‘x’. 

Solution

No. of terms = 10
Mean = 69.5
Sum of the numbers = 69.5 x 10 = 695 ……….(i)
But sum of numbers = 72+70+x+62+ 50+71+90+64+58+82
= 619 + x ……(ii)
from (i) and (ii)
619 + x = 695
x = 76 

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 Selina Solution for Selina ICSE Concise Mathematics for Class 10 (2019-20) (2020 to Current)
Chapter 24: Measure of Central Tendency(Mean, Median, Quartiles and Mode)
24A | Q: 8
Solution If 69.5 is the Mean of 72, 70, ‘X’, 62, 50, 71, 90, 64, 58 and 82, Find the Value of ‘X’. Concept: Measures of Central Tendency - Mean, Median, Mode for Raw and Arrayed Data.
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