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Tcecarenko [31]
3 years ago
5

Does anybody know this???

Mathematics
1 answer:
VLD [36.1K]3 years ago
3 0

Answer:

17

Step-by-step explanation:

Let x be the number of books and y the number of CDs,

x+y=25\\

The prices of the products are multiplied with the quantity bought, therefore:

1.5x + 5y = 65.50

Multiplying the first equation by -5, then multiplying the two equations:

-3.5x=-59.5\\x=17

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1. It is 95% certain that the true mean lies in the interval 16-36 years.

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<u>Question 2: </u>

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