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lana66690 [7]
3 years ago
7

How many commuters must be randomly selected to estimate the mean driving time of Chicago commuters? We want 95% confidence that

the sample mean is within 5 minutes of the population mean, and the population standard deviation is known to be 7 minutes.
Mathematics
1 answer:
lukranit [14]3 years ago
5 0

Answer: 25 computers will be selected

Step-by-step explanation:

Where: Z -value at 95% confidence = 1.96; SD = Standard deviation = 10 minutes; N = Sample size; Margin error = 4 minutesSubstituting;4 = 1.96*10/Sqrt (N)Sqrt (N) = (1.96*10)/4 = 4.9N = 4.9^2 = 24.01 ≈ 25

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Figure A is a scale image of Figure B
valina [46]

Answer:

x = 30

Step-by-step explanation:

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OR...

27x = 810.

THEN...

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x = 30

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2 years ago
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What is the distance between (2,-9) and (-1,4)
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2 years ago
in each diagram below, line A is parallel to line B. in which diagram does the alternate interior angle postulate justify angle
Firlakuza [10]

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3 0
3 years ago
The number of ways in which 4 squares can be chosen at random on a chess board such that they lie on a diagonal line?.
wariber [46]

The number of ways is 364 if the number of ways in which 4 squares can be chosen at random.

<h3>What are permutation and combination?</h3>

A permutation is the number of different ways a set can be organized; order matters in permutations, but not in combinations.

It is given that:

On a chessboard, four squares are randomly selected so that they are adjacent to each other and form a diagonal:

The required number of ways:

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= 2[2[ 1 + 5 + 15+35] + 70]

= 364

Thus, the number of ways is 364 if the number of ways in which 4 squares can be chosen at random.

Learn more about permutation and combination here:

brainly.com/question/2295036

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