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aev [14]
3 years ago
7

What is the probability of drawing a blue marble? 3/7 70% 1/3 3/10

Mathematics
2 answers:
vazorg [7]3 years ago
4 0

Answer:

3/10

Step-by-step explanation:

There are 20 marbles.  6 of them are blue.

P = 6/20 = 3/10

Alekssandra [29.7K]3 years ago
3 0
The answer will be 3/10
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Answer:

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Step-by-step explanation:

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3 years ago
4. IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. In a
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675 people will have score between 85 and 120

Step-by-step explanation:

Given

Mean = 100

SD = 15

If we have to find percentage of score between two values we have to find the z-score for both values and then area under the curve for both values

z-score is given by:

for a value x:

z-score = \frac{x-mean}{SD}

So,

For 85:

z-score = z_1 = \frac{85-mean}{SD}\\ = \frac{85-100}{15}\\=\frac{-15}{15}\\=-1

z-score = z_2 = \frac{120-mean}{SD}\\ = \frac{120-100}{15}\\=\frac{20}{15}\\=1.3333

Now we have to find the area under the curve for both values of z-score. z-score tables are used for this purpose.

So,

For z1 : 0.1587

For z2: 0.9082

The area between z11 and z2:

z_2-z_1 = 0.9082-0.1587=0.7495

So the probability of score between 85 and 120 is 0.7495

As the sample is of 900 people, the people with scores between 85 and 120 will be:

900*0.7495 = 674.55 people

Rounding off to nearest whole number

675 people will have score between 85 and 120

Keywords: Probability, SD

Learn more about probability at:

  • brainly.com/question/10978510
  • brainly.com/question/11007026

#LearnwithBrainly

4 0
3 years ago
Evaluate 3m-n when m=5 and n=1
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Answer:

Basically that’s saying 3 • 5 - 1 which will equal 14

Step-by-step explanation:

3•5 = 15 - 1 = 14

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My real estate agent told me that my house appreciated in value over the last three years. In other words, it has gone from bein
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Answer:

56

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102.500÷×+÷110,000

56

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3 years ago
What is 40.15 divided by 7.3, written as a decimal?
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The answer is 5.5.
hope this helps!!
5 0
3 years ago
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