The average of n observation is 42. If o

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Target Exam

CUET

Subject

General Test

Chapter

Numerical Ability

Topic

Average

Question:

The average of n observation is 42. If one observation of value 87 is added, then the average of all observations is 57 . What is the value of n ?

Options:

Correct Answer:

Explanation:

42 × n + 87 = 57 (n + 1)

42n + 87 = 57n + 57

15n = 30

n = 2