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never [62]
3 years ago
12

X+Y=9 $21.50x+$21.70y=$215.70

Mathematics
1 answer:
faltersainse [42]3 years ago
4 0

Answer:You already answer the question what is there to answer again?

Step-by-step explanation:

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uysha [10]

Answer:

a) 20%

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Step-by-step explanation:

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b)The percentage of tests that require less than one minute (60 seconds) is:

P(X70) =0.4 = 40\%

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M=\frac{A+B}{2}=\frac{50+75}{2}\\ M= 62.5\ seconds\\\\V=\frac{(B-A)^2}{12}=\frac{(75-50)^2}{12}\\  V= 52.083\ seconds

Mean = 62.5 seconds.

Variance = 52.083 seconds.

3 0
3 years ago
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Answer:

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