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nasty-shy [4]
2 years ago
14

Scores on a standardized test are normally distributed find percentage

Mathematics
1 answer:
jasenka [17]2 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.

5 0
3 years ago
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...
6 0
3 years ago
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

8 0
3 years ago
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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

6 0
3 years ago
Which combination of integers can be used to generate the Pythagorean triple (7, 24, 25)
amm1812

Answer:

3

Step-by-step explanation:

7 0
3 years ago
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