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Consider the statistics of two sets of observations as follows:

If the variance of the combined set of these two observations is 17/9 , then the value of n is equal to ___________.
    Correct answer is '5'. Can you explain this answer?
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    Consider the statistics of two sets of observations as follows:If the ...

    ⇒ 17n2 + 1700 + 340n = 90n + 9(n2 + 30n + 200)
    ⇒ 8n2 - 20n - 100 = 0
    ⇒ 2n2 - 5n - 25 = 0

    Hence, n = 5
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    Consider the statistics of two sets of observations as follows:If the variance of the combined set of these two observations is 17/9 , then the value of n is equal to ___________.Correct answer is '5'. Can you explain this answer?
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