A store sells four printers for every five computers. The store sells 40 computers on Saturday. How many printers did it sell on
1 answer:
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Answer:
The mean of the remaining 3 boys is 51.
Step-by-step explanation:
The mean mark of the entire group (), dimensionless, is:
(Eq. 1)
()
(Eq. 1b)
Where is the mark of the i-th boy, dimensionless.
In addition, we know the following mean marks from statement:
(Eq. 2)
()
(Eq. 2b)
(Eq. 3)
Where:
- Mean mark of the first 7 boys, dimensionless.
- Mean mark of the remaining 3 boys, dimensionless.
By applying sum properties in (Eq. 1b) and using (Eq. 2b) and (Eq. 3), we obtain the mean of the remaining 3 boys:
The mean of the remaining 3 boys is 51.