Matematika

Pertanyaan

berapa nilai a
jika rata ratanya 34 1/3 dan mediannya 33
berapa nilai a jika rata ratanya 34 1/3 dan mediannya 33

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  • mean=25+25+28+29+a+31+a+5+b+b+2+
    42+45+48/12
    34 1/3 . 12= 280 + 2a +2b
    412 = 280 +2a +2b
    412 -280 = (a+b)2
    132 = (a+b)2
    132 : 2 =a+b
    66 = a+b
    Median = 31 + a+ 5/2
    33 = a+36/2
    66 = a + 36
    a = 36
    a+b =66
    36 + b =66
    b = 30

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