3 years ago

Scores on a standardized test are normally distributed find percentage

Mathematics

1 answer:

jasenka [17]3 years ago

3 0

Whats the question so I can answer

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A sample of 1800 computer chips revealed that 53% of the chips do not fail in the first 1000 hours of their use. The company's p

charle [14.2K]

Answer:

So the value of the test statistic is -0.85.

Step-by-step explanation:

We know that a sample of 1800 computer chips revealed that 53% of the chips do not fail in the first 1000 hours of their use. The company's promotional literature states that 54% of the chips do not fail in the first 1000 hours of their use.

We get that:

$n=1800\\\\p_1=53\%=0.53\\\\p_2=54\%=0.54\\$

We calculate the standar deviation:

$\sigma=\sqrt{\frac{0.53 \cdot (1-0.53)}{n}}=\sqrt{\frac{0.53 \cdot 0.47}{1800}}=0.01176$

We calculate the value of the test statistic:

$z=\frac{p_1-p_2}{\sigma}=\frac{0.53-0.54}{0.01176}=-0.85$

So the value of the test statistic is -0.85.

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Megan bikes 10 mi in 40 min. At this rate, how far can she bike in 60 min?

Anna71 [15]

I'd say 35-40 miles...

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Which of the following are necessary when proving that the opposite angles of a parallelogram are congruent? A. Opposite sides a

Misha Larkins [42]

Answer:

C and B

Step-by-step explanation:

The correct option is option B and C. The necessary condition to prove that the opposite angles of a parallelogram are congruent:

C. Angle Addition Postulate.

B. Opposite sides are congruent

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In a recent class vote, 39% of the students voted to have online assignments. What is 39% written as a decimal?

serg [7]

Answer:

0.39

Step-by-step explanation:

39/100=0.39

%=100

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Which combination of integers can be used to generate the Pythagorean triple (7, 24, 25)

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Step-by-step explanation:

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