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If arithmetic progression mean of (a-1), …

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If arithmetic progression mean of (a-1), (a+3), (a+11),and (a+17) is 10. Find the value of a.

    • Posted by Tanzeem Yohan 6 years, 11 months ago

    CBSE > Class 12 > Mathematics
    • 1 answers

    Gaurav Seth 6 years, 11 months ago

    Given Mean = 10

    10 = [a - 1 +a +3 + a + 11 + a + 17 ] ÷ 4

    40 = 4a + 30

    40 - 30 = 4a

    10 = 4a

    a = 10/4 = 5/2

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