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dusya [7]
3 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.)
Mathematics
1 answer:
Sedbober [7]3 years ago
5 0

Answer:

47.5%

Step-by-step explanation:

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2 years ago
A={ 0,1,3,5,6}; B={1,2,3,7} draw the venn diagram of AUB Writ​
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Answer:

Here,

n(A)={0,1,3,5,6}

n(B)={1,2,3,7}

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Step-by-step explanation:

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8 0
2 years ago
For 3/4 of a pound of peanuts, Jimmy paid $2.35. What is the unit rate (dollars per pound)? *
Tpy6a [65]

Answer:

$3.13/lb

Step-by-step explanation:

Divide 3/4 pound into $2.35:

$2.35

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8 0
3 years ago
If your friend leaves your house at a speed of 8mph and two hours later you follow in your car at 40mph, how long will It be bef
dusya [7]

Answer:

  • 1/2 hour
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Step-by-step explanation:

Your friend has a head start of (2 h)×(8 mi/h) = 16 mi.

When you leave, you gain on your friend at the rate of 40 mph - 8 mph = 32 mph. So, it will take ...

  (16 mi)/(32 mi/h) = 1/2 h

for you to reduce the distance between you to zero.

In that 1/2 hour, you have traveled ...

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This is the same distance your friend has traveled in 2.5 hours at 8 mi/h.

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3 years ago
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