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2 years ago

7

The mean score of a placement exam for entrance into a math class is 80, with a standard deviation of 10. Use the empirical rul

e to find the percentage of scores that lie between 60 and 80. (Assume the data set has a bell-shaped distribution.)

1 answer:

Sedbober [7]2 years ago

5 0

Answer:

47.5%

Step-by-step explanation:

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Help asap my last question GIVING BRAINLIST!!!!

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Answer:

1) $x < 0$

2) $x > 0$

3) $x < 10$

4) $x < -\frac{31}{55}$

5) $x \geq 0$

6) $x \geq -1$

Step-by-step explanation:

1) $-3 > 2x -3$

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$2x - 3 + 3 < -3 +3$

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3) $\frac{x}{5} -2 < 0$

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4) $-5x + 11 > 31$

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$\frac{-55x}{-55} > \frac{31}{-55}$

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5) $\frac{1}{2}x - 4 \geq -4$

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6 0

3 years ago

Round to the tenths place .712 .665 .545

Artyom0805 [142]

.712 rounds to .7

.665 rounds to .7

.545 rounds to .5

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Solve the system of linear equations. separate the x- and y- values with a coma. -5x+6y=33 -18x+4y=-22

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I hope I can help you:)

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