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Bond [772]
3 years ago
11

ACT scores have a mean of 21.5 and 26 percent of the scores are above 24. The scores have a distribution that is approximately n

ormal. Find the
standard deviation. Round your answer to the nearest tenth, if necessary.
Mathematics
1 answer:
lutik1710 [3]3 years ago
7 0

Answer:

5

Step-by-step explanation:

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Solve the following systems of 3-variable linear equations.​
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Answer:

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Step-by-step explanation:

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3. A garden is going to be built in the city park in the shape of a parallelogram with a rectangular walkway
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Answer: i dont know the answer but find the area of each shape then add them together

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A new medical test provides a false positive result for hepatitis 2% of the time that is a perfectly healthy subject being teste
Oxana [17]
Given that X <span>be the number of subjects who test positive for the disease out of the 30 healthy subjects used for the test.

The probability of success, i.e. the probability that a healthy subject tests positive is given as 2% = 0.02


Part A:

</span><span>The probability that all 30 subjects will appropriately test as not being infected, that is the probability that none of the healthy subjects will test positive is given by:

</span>P(X)={ ^nC_xp^x(1-p)^{n-x}} \\  \\ P(0)={ ^{30}C_0(0.02)^0(1-0.02)^{30-0}} \\  \\ =1(1)(0.98)^{30}=0.5455
<span>

Part B:

The mean of a binomial distribution is given by

</span>\mu=np \\  \\ =30(0.02) \\  \\ =0.6
<span>
The standard deviation is given by:

</span>\sigma=\sqrt{np(1-p)} \\ \\ =\sqrt{30(0.02)(1-0.02)} \\ \\ =\sqrt{30(0.02)(0.98)}=\sqrt{0.588} \\  \\ =0.7668
<span>

Part C:

This test will not be a trusted test in the field of medicine as it has a standard deviation higher than the mean. The testing method will not be consistent in determining the infection of hepatitis.</span>
5 0
3 years ago
How does moving the place of a digit change its value
AlexFokin [52]
In the familiar decimal number system that we use every day, moving the place
of a digit changes its value by a power of 10 .

In a system of numbers to any other base, moving the place of a digit changes
its value by a power of whatever the base of that number system is.
6 0
3 years ago
Kelly has read 5/6 of a book helen has read 9/12 of the same book who read more of the book?
kupik [55]

Answer:

Kelly has read more of the book

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2 years ago
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