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babymother [125]
3 years ago
7

four red boxes and two black boxes cost $40. Five red boxes cost $20. All red boxes cost the same. All black boxes cost the same

. What is the ratio of the cost of a red box to the cost of a black box.
Mathematics
1 answer:
exis [7]3 years ago
8 0
The ratio of red to black is 1:3
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As per the question:

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P(6.2 < X < 9.3) = P(\frac{6.2 - 11.7}{2.8} < \frac{X - \mu}{\sigma} < \frac{9.3 - 11.7}{2.8})

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