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3 years ago

15

A VCR is programmed to record a TV show that lasts for half-hour. If the cassette tape accommodate 180 min. what percent of tape

is used?

1 answer:

9966 [12]3 years ago

4 0

Half hour= 30 minutes
30/180=1/6= 0.16666666~16.7%

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Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.3. (Round your ans

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Answer:

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Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 50

Standard Deviation, σ = 1.3

Sample size, n = 12

We are given that the distribution of hardness of pins is a bell shaped distribution that is a normal distribution.

Formula:

$z_{score} = \displaystyle\frac{x-\mu}{\sigma}$

Standard error due to sampling =

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Calculation the value from standard normal z table, we have,

$P(x \geq 51) = 1 - 0.9961= 0.0039$

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