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77julia77 [94]
3 years ago
7

Can someone help me and tell me how u got it

Mathematics
2 answers:
Elena-2011 [213]3 years ago
8 0
The answer is A
a. first you subtract 11 from 15 to get 4
b. then you find the LCM of 12 and 8 which is 24
c. divide 24 by 12 and multiply by 5=10
d. divide 24 by 8 and multiply by 1=3
e. subtract your answer in d. from c. = 10-3=7
your answer in e over your LCM
your final answer =option A
sladkih [1.3K]3 years ago
6 0
Here is your first answer:                                                                                                                                 First find the multiple which is 24                                                                           12*2=24 and 8*3=24 (denominator is 24)                                                             5*2=10 and 1*3=3 then subtract 10-3=7                                                               Then subtract the whole numbers 15-11=4                                                            Your first answer is 4 7/24 or A.                                                            Here is your second answer:                                                                                                                                                                                                               First find the multiple which is 80                                                                         8*10=80 and 10*8=80 (denominator is 80)                                                         5*10=50 and 3*8=24 then subtract 50-24=26                                                     26/2=13 and 80/2=40                                                                                        Your answer is 13/40 or A
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Answer:

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Step-by-step explanation:

Google is your friend for such conversions. It will generally give answers correct to 6 significant figures.

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Normal atmospheric pressure is defined as 1 atmosphere.

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5 0
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A multiple choice exam has ten questions. Each question has five possible answers, of which one is correct. Suppose that a stude
Ber [7]

Answer:

8.81% probability that the student answers exactly 4 questions correctly

Step-by-step explanation:

For each question, there are only two possible outcomes. Either he answers it correctly, or he does not. The probability of answering a question correctly is independent of other questions. So we use the binomial probability distribution to solve this question.

Binomial probability distribution

The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}

In which C_{n,x} is the number of different combinations of x objects from a set of n elements, given by the following formula.

C_{n,x} = \frac{n!}{x!(n-x)!}

And p is the probability of X happening.

A multiple choice exam has ten questions.

This means that n = 10

The probability of answering any question correctly is 0.20.

This means that p = 0.2

What is the probability that the student answers exactly 4 questions correctly

This is P(X = 4).

P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}

P(X = 4) = C_{10,4}.(0.2)^{4}.(0.8)^{6} = 0.0881

8.81% probability that the student answers exactly 4 questions correctly

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