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3 years ago

Please help ASAP!!!!!

Mathematics

1 answer:

ivann1987 [24]3 years ago

6 0

Answer:

90°?..........................

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$248.62 rounded to the nearest dollar

Alecsey [184]

$248.62 rounded to the nearest dollar would be $249.

That is because numbers 1-5 would round a number down and numbers 6-9 would round a number up.

Since the number in the tenth place is 6 it would round up to $249

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3 years ago

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a number has 7 at the tens place .there is zero in the thousand place. the number 5 is at the hundreds place .there is number 1a

crimeas [40]

10570 - ten thousand, five hundred and seventy

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3 years ago

Forty-nine cities provided information on vacancy rates (in percent) for local apartments in the following frequency distributio

Nostrana [21]

Answer:

$E(X) = \frac{431.5}{49}= 8.81$

$s^2 = \frac{4780.25- \frac{(431.5)^2}{49}}{48} = 20.425$

$s= \sqrt{20.425}= 4.52$

Step-by-step explanation:

For this case we can calculate all the questions with the following table:

Class Midpoint(Xi) fi Xi*fi Xi^2 *fi

____________________________________

0-3 1.5 6 9 13.5

3-6 4.5 6 27 121.5

6-9 7.5 11 82.5 618.75

9-12 10.5 21 220.5 2315.25

12-25 18.5 5 18 1711.25

_____________________________________

Total 49 431.5 4780.25

We can calculate the expected value with the following formula:

$E(X) = \frac{\sum_{i=1}^n X_i P(X_i)}{n}$

And if we replace we got:

$E(X) = \frac{431.5}{49}= 8.81$

We can calculate the sample variance with the following formula:

$s^2 =\frac{\sum X^2 f -\frac{(\sum xf)^2}{n} }{n-1}$

And replacing we got:

$s^2 = \frac{4780.25- \frac{(431.5)^2}{49}}{48} = 20.425$

And the deviation would be just the square root of the variance like this:

$s= \sqrt{20.425}= 4.52$

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3 years ago

Angle BCD is a circumscribed angle of circle A. Angle BCA measures 40°.

TEA [102]

Answer:

100°

Step-by-step explanation:

I just took the test

8 0

4 years ago

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Uh what is 70 times 70 and the square route of 30

almond37 [142]

Answer:

4900

Square Root of 30: 5.47722557505- round it up

Step-by-step explanation:

70x70

7x7=49

add the 2 zeros at the end

4900

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3 years ago

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