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3 years ago

HELP ME PLEASEEEEEEEEEEEE

Mathematics

2 answers:

Annette [7]3 years ago

6 0

Answer:

20 feet

Step-by-step explanation:

$1)\ A = \frac{b * h}{2}$

$2)\ 120 = \frac{12b}{2}$

$3)\ 12b = 240$

$4)\ b = 20$

lord [1]3 years ago

6 0

Answer:

Step-by-step explanation:

120 Divided by 12 = 10

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IrinaK [193]

Answer:

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Step-by-step explanation:

Assuming the distribution for the mean life is approximately normal, with mean 120 months and variance 64 months^2, we can calculate the parameters for a sampling distribution with sample size = 89 computers.

The sampling distribution mean will be equal to the mean for a single computer:

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The standard deviation will be adjusted by the sample size as:

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With these parameters, we can calculate the z-score for X=118.81.

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Then, the probability that the mean of a sample of 89 computers is less than 118.81 months is:

$P(X$

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