Question 853309
Mean Average is sum divided by the count.

Let x - be the score she needs to get 80.

Therefore,

{{{(65+72+74+84+94+x)/6=80}}}
{{{(389+x)/6=80}}} Then multiple both sides by 6
{{{389+x=480}}}
{{{x=91}}}

Therefore to get a mean average of 80, Brook must get a score of 91!


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