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lisov135 [29]
3 years ago
13

You are to take a multiple-choice exam consisting of 100 questions with 5 possible responses to each question. Suppose that you

have not studied and so must guess (randomly select one of the five answers) on each question. Let x represent the number of correct responses on the test. What is your expected score on the exam?
Mathematics
1 answer:
xeze [42]3 years ago
6 0

Answer:

20

Step-by-step explanation:

This is a binomial distribution

n = 100; p = 1/5

E(x) = np = (100)(1/5) = 20

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if alyssa plans to run 7/8 mile on a trail at one point she sees that she is at mile maker 0.3 How much farther does she have to
Sever21 [200]

Rewrite 7/8 as a decimal by dividing 7 by 8:

7/8 = 0.875

Now to find how much further she has to run subtract where is now from the total distance:

0.875 - 0.3 = 0.575

She needs to run 0.575 miles more

6 0
3 years ago
Jessica earns $800 each month working a part-time job. She wants to save a total of $2,400 for college over a one-year period. W
Stolb23 [73]

Answer:

25% should go

Step-by-step explanation:

If she wants to save $2,400;

Then in a month, she should save 2400/12 = 200

So now we need the amount of her monthly earnings will this savings be

That will be;

200/800 * 100%

= 1/4 * 100% = 25%

8 0
3 years ago
What is one half added to three quarters
Eduardwww [97]
1/2 + 3/4 = 2/4 + 3/4 = 5/4  = 1  1/4 
                 Here I change to the common denominator 4 so I could add them.
8 0
3 years ago
A particular brand of gasoline has a density of 0.737 g/ml at 25 ∘c. how many grams of this gasoline would fill a 13.4 gal tank
ruslelena [56]

Given, the density of a particular brand of gasoline = 0.737 g/ml.

13.4 gallon of tank given. We have to find the mass of gasoline to fill the tank.

First we will convert 13.4 gallon to ml.

We know that 1 gallon = 3.78541 litre

And 1 litre = 1000 ml

So we can write 1 gallon = (3.78541)(1000) ml = 3785.41 ml.

13.4 gallon = (3785.41)(13.4) ml = 50724.494 ml.

Let's take there is x grams of gasoline

We know that density = (mass/ volume) = \frac{x}{50724.494}

So we can write,

0.737 =\frac{x}{50724.494}

To find x we will multiply both sides by 50724.494. we will get,

(0.737)(50724.494) =(\frac{x}{50724.494}) (50724.494)

(0.737)(50724.494) = x

37383.95 = x

So we have got the required answer.

Mass of gasoline = 37383.95 grams.

5 0
4 years ago
A student computed the average of her 7 test scores by adding the scores together and dividing this total by the number of tests
mina [271]
After the new test, she now has taken 8 tests.
Set it up just like when finding the average:
(87+79)/8
Solve for the new test average
7 0
3 years ago
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