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malfutka [58]
2 years ago
14

the mean of normally distributed test scores is 80 and the standard division is 5. If there are 186 test scores in the data samp

le, how many of them were in the 75 to 80 range?

Mathematics
1 answer:
Marizza181 [45]2 years ago
5 0

Answer:

63

Step-by-step explanation:

score 75 is one standard dev below the mean ====>to the mean  encompasses approx 34% of scores

.34 * 186 = 63

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Answer:

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Step-by-step explanation:

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To answer this question, we shall be using an exponential approximation.

Now, to use this exponential approximation, we shall be needing a supporting exponential mathematical equation.

This can be written as;

A = I(1-r)^t

where A is the new area we are looking for

I is the initial area which is 1700 according to the question

r is the rate of decrease which is 3.5% = 3.5/100 = 0.035

t is time which is 9 years according to the question

We plug these values and have the following;

A = 1700(1-0.035)^9

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This is 1,234 km^2 to the nearest square kilometer

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Step-by-step explanation:

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3 years ago
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Step-by-step explanation:

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Answer:

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Since this is a right triangle, we can use the Pythagorean theorem

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-- The graph looks like a line that passes through the origin,
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. . . . . Call the first one 'x'.  Call the second one 'y'.

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Rinse and repeat, as many times as you like,
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3 years ago
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