Charlin got 20 questions correct on her exam and scored a 80%. How many (total) questions were on the exam

Mathematics

1 answer:

Neko [114]3 years ago

6 0

The answer would be 25

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What is the sum of the first seven terms of the geometric series 3 − 6 + 12 − . . . ?

maks197457 [2]

3-6+12=9
Steps
you have to add first so you must add -6+12 which will be -6
Then you will take 3 - - 6 which will make it 9

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3 years ago

which fraction is halfway between 1/2 and 5/6? A. 2/3 B. 4/3 C.3/5 D.7/12 And another question Arrange these numbers from least

storchak [24]

1st Question:

1/6, 2/6, 3/6 = 1/2, 4/6, 5/6, 6/6.

Halfway between 1/2 and 5/6 is 4/6 = 2/3.

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2nd Question: Could've been worked out on a calculator.

-5/6, -7/9, -3/5, -3/7

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4 years ago

A recent survey by the American Cancer Society shows that the probability that someone is a smoker is P(S) = 0.19. It has also d

nekit [7.7K]

0.19*0.158=0.03002 -------> 0.03

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3 years ago

A drunk person is walking on the road. With probability 0.6 he takes a step forward and with probability 0.4 he takes a step bac

Molodets [167]

If a person after 10 steps is at his starting position, then this person takes 5 steps forward and 5 steps backward.

This is a binomial distribution with

probability to take step forward $p=0.6;$
probability to take step backward $q=0.4;$
$n=10.$

Then

$Pr(\text{5 steps forward and 5 steps backward})=C_{10}^5p^5q^5=\\ \\=\dfrac{10!}{5!(10-5)!}\cdot (0.6)^5\cdot (0.4)^5=\dfrac{10!}{5!\cdot 5!}\cdot (0.6\cdot 0.4)^5=\\ \\=\dfrac{5!\cdot 6\cdot 7\cdot 8\cdot 9\cdot 10}{5!\cdot 2\cdot 3\cdot 4\cdot 5}\cdot (0.24)^5=7\cdot2\cdot 9\cdot 2\cdot (0.24)^5=252\cdot (0.24)^5=0.2006581248.$