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zysi [14]
3 years ago
13

Maggie answered 20 out of 25 questions correctly on a math test. What percent of the questions did she answer correctly?​

Mathematics
2 answers:
Marina86 [1]3 years ago
4 0

20/25 x 100 —> 2000/25 = 80%

Karolina [17]3 years ago
3 0

Answer:

80%

Step-by-step explanation:

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A bag contains $3$ white chips and $3$ red chips. you repeatedly draw a chip at random from the bag. if it's white, you set it a
Natasha2012 [34]

Answer:

8.5

Step-by-step explanation:

We can divide this experiment in three parts.

  • Before removing any white chip
  • After ramoving one white chip, and before removing two
  • After removing two white chips

For the first experiment, for each extraction we will always have 3 white chips and 3 red chips, becuase if we extract a red chip, then we put it back in the bag, and if it is a white chip, then the experiment ends there. The probability of taking out a white chip is 1/2.

For the second experiment, we will have always 2 white chips, and 3 red chips. So the probability of success is 2/5 = 0.4

For the third experiment, we will have always 1 white chip and 3 red chips, so the probability of success if 1/4 = 0.25.

We want to know how many extractions we need for each experiment until we pick a white chip. Note that each experiment is independent of each other, and each one has geometric distribution, the first one with probability of success 0.5, the second one with probability of success 0.4, and the third one with p = 0.25.

The total experiment, X, is the sum of this random variables, so the expected value of the total experimet is the sum of the expected value from each of its parts, lets call them, X₁, X₂ and X₃. Thus,

E(X) = E(X_1) + E(X_2) + E(X_3) = \frac{1}{0.5}+\frac{1}{0.4} +\frac{1}{0.25} = 2 + 2.5 + 4 = 8.5

The expected number of draws is 8.5.

I hope i could help you!  

7 0
3 years ago
Yuki bought a dress on sale for $72. The sale price was 60% of the original price. What was the original price of the dress?
Ronch [10]

The original price would be 43.20.

6 0
3 years ago
Read 2 more answers
Barbara uses 1 3/4 teaspoons of sugar to make a cup of hot chocolate. How many teaspoons of sugar should be use to make 10 cups
Amiraneli [1.4K]
17.5 teaspoons of sugar
6 0
3 years ago
1) What do u mean by Trigonometry ?​
tankabanditka [31]

Step-by-step explanation:

Trigonometry, the branch of mathematics concerned with specific functions of angles and their application to calculations. There are six functions of an angle commonly used in trigonometry. Their names and abbreviations are sine (sin), cosine (cos), tangent (tan), cotangent (cot), secant (sec), and cosecant (csc).

7 0
3 years ago
Read 2 more answers
The earth has an average diameter of 12.800km. If you walked 24 hours a day, 5 days a week (and if you could walk on water)at a
Dimas [21]
1) Circumference of Earth: Diameter x π → 12,800 x π = 40,212.39 km 

2) time in Hour = distance/speed → distance = 40,212.39 and speed = 2 Mi/h 

1st: convert miles into km : 1 mile = 1.609344 km and 2 miles = 3.218688 km
2nd: convert speed into km/h → speed = 3.218688 km/h
And time in hour = 40,212.39 / 3.218688 → time = 12,493 hours  OR in days:
12,493 / 24 = 521 days (OR 104 weeks, including 2 days of rest)

4 0
3 years ago
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