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Dominik [7]
3 years ago
7

I cannot understand this can you guys help

Mathematics
1 answer:
igor_vitrenko [27]3 years ago
5 0
The mean is not the same thing as median
mean=78+81+85+87=331
mean=331/4=82.75
median is the middle number, but you have a par set of numbers, so your median will be the middle numbers 78,81,85,87 , which are 81+85=166, 166/2=83
83 is your median
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A^2-a+12=0 I need the roots
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