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ICSE Class 10 Answered

the mean of following numbers is 68.find the value of "x".45,52,60,x,69,70,26,81,and 94.Hence, estimate the median.

 

Asked by shaju | 30 Apr, 2019, 12:14: PM
Expert Answer
Mean = Sum of all the observations/ number of observations
→ 68 = (45+52+60+69+70+26+81+94+x)/9
→ 612 = 497 + x
→ x = 115
 
Data in the ascending order,
26, 45, 52, 60, 69, 70, 81, 94, 115
 
Here n(number of observations) = 9 .... odd
 
→ Median = [(n + 1)/2]th observation = 5th observation = 69 

 

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