Question 420085
You need the definition of an average. It is:
Average of data samples = (sum of data samples) / (number of samples)
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Lety the score of the last test  = {{{x}}}
{{{ .92 = (6*.91 + x) / 7 }}}
{{{ .92*7 = 5.46 + x }}}
{{{ x = 6.44 - 5.46 }}}
{{{ x = .98 }}}
You need a 98%