find the mean of a,a+3,a+5,a+7 is equal to 25.5 then evaluate the value of a.
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a +(a + 3 )+(a + 5 )+(a + 7)
------------------------------------- = 25.5
4
4a + 15
---------- = 25.5
4
4a + 15 = 4(25.5) ( by cross multiplication)
4a + 15 = 102
4a = 102 -15
4a = 87
a = 87/4
a = 21.75
------------------------------------- = 25.5
4
4a + 15
---------- = 25.5
4
4a + 15 = 4(25.5) ( by cross multiplication)
4a + 15 = 102
4a = 102 -15
4a = 87
a = 87/4
a = 21.75
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