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The set {5, 8, 10, 16, 18, 28, 30, x} has eight members. The mean of the set's members is 4.5 less than x. What is the value of  x?

 Jul 1, 2022
 #1
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( 5 + 8 + 10+ 16 + 18 + 28 + 30 + x )  / 8  =  x - 4.5

 

(115 + x)  =  8 ( x - 4.5)

 

115 + x  = 8x  - 36

 

115 + 36   = 8x   - x

 

151  = 7x

 

151 / 7 =   x

 

 

cool cool cool

 Jul 2, 2022

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