Markevch Markevch
  • 02-03-2018
  • Mathematics
contestada

Please HELP ASAP!!!!!!

Please HELP ASAP class=

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Аноним Аноним
  • 19-07-2018

The mean of a collection of values is the sum of all values, divided by how many values there are.


Your values are 5.2, 8.3, 8.5, 7.7, 7.8 and y, so you have 6 values.


This means that the mean is


[tex] \frac{5.2 + 8.3 + 8.5 + 7.7 + 7.8 + y}{6} = \frac{37.5+y}{6}[/tex]


And since we want it to be 7.1, we impose


[tex] \frac{37.5 + y}{6} =7.1 [/tex]


To solve this for y, multiply both sides by 6


[tex] 37.5 + y =42.6 [/tex]


and subtract 37.5 from both sides


[tex] y = 5.1 [/tex]


So, the correct option is the second one.

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