Jacob has golf scores of 120, 112, 130, 128, and 124. he wants to have a mean, or average, golf score of 118. what score does he need in his next golf game to achieve this mean score?

Average  golf score = summation of the golf scores/ number of  items or golf scores
where:
total score = 120+112+130+128+124+x
number of items = 6
average score = 118
substituting the requirements:
x =  94 
 
Jacob will need a golf score of 94  to achieve the average of 118

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