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vivado [14]
3 years ago
15

An instructor gives his class a set of 20 problems with the information that the next quiz will consist of a random selection of

10 of them. If a student has figured out how to do 16 of the problems, what is the probability the he or she will answer correctly
(a) all 10 problems?
(b) at least 9 problems?
Mathematics
1 answer:
Illusion [34]3 years ago
8 0

Answer:

(a) Probability he or she will answer all 10 problems correctly is 0.5

(b) Probability he or she will answer at least 9 problems correctly is 0.95

Step-by-step explanation:

(a) Probability is given by number of possible outcomes ÷ number of total outcomes

Number of possible outcomes = 10 problems

Number of total outcomes = 20 problems

Probability he or she will get all 10 problems correctly = 10 ÷ 20 = 0.5

(b) Probability he or she gets at least 9 problems correctly means he or she either gets 9 or the 10 problems correctly

Probability he or she gets at least 9 problems correctly = (9÷ 20) + (10÷20) = 0.45+0.5 = 0.95

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Contact [7]
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To find the first missing number, you will do 8 * 8 = 64 ... This shows that she makes $64 in 8 hours.

To find the second missing number, you will do 56/8 = 7 ... This shows that she makes $56 in 7 hours.

Part B) Barb makes $9 every hour. To find the amount of money she earns for 5, 6, and 8 hours of work you will need to multiply $9 by the amount of hours she worked.

9 * 5 = 45 ... This shows that she makes $45 in 5 hours.

9 * 6 = 54 ... This shows that she makes $54 in 6 hours.

9 * 8 = 72 ... This shows that she makes $72 in 8 hours.

Part C) In part B, you found out how much she makes after working at the theme park for 5 hours. ($45 in 5 hours)

Next, you'll need to find out how much she makes after mowing lawns for 5 hours.
5*8 = $40 ... This shows that she makes $40 in 8 hours

Now you need to the difference. 45 - 40 = 5 ... She makes 5 more dollars working at the theme park for 5 hours than mowing lawns for 5 hours.
6 0
4 years ago
3(v + 2) + 4 = 13<br> HELP ME!!
Zolol [24]

3(v + 2) + 4 = 13

Mutiply the bracket by 3

(3)(v)= 3v

(3)(2)= 6

3v+6+4= 13

3v+10=13

Move +10 to the other side

Sign changes from +10 to -10

3v+10-10= 13-10

3v= 13-10

3v= 3

divide both sides by 3

3v/3= 3/3

v= 1

Answer : v= 1

4 0
4 years ago
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(URGENT, IN THE MIDDLE OF A QUIZ!)<br> (Math)
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Answer: D

Step-by-step explanation:

The pythagorean theorem shows that a^{2} +b^2= c^2.

This shows that the two shaded squares are equal, so D is incorrect.

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3 years ago
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just olya [345]
For 21 Oz, price is 2.94
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In short, Your Answer would be $0.14 cereal per oz.

Hope this helps!
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4 years ago
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PilotLPTM [1.2K]

Given: 2/3 every 30 seconds

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