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3 years ago

Two fewer than a number doubled is the same as the number decreased by 38. Find the number.

Mathematics

2 answers:

djyliett [7]3 years ago

7 0

<span>2n - 2 = n - 38

hope it helps</span>

Nady [450]3 years ago

3 0

Answer:

the 2nd option is the right one

Step-by-step explanation:

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For each of the following binomial random variables, specify n and p. (a) A fair die is rolled 50 times. X = number of times a 5

Keith_Richards [23]

Answer:

a) $n = 50, p = \frac{1}{6}$

b) $n = 16, p = \frac{1}{100}$

c) $n = 26, p = 0.25, \mu = 6.5$

Step-by-step explanation:

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 combinatios 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) A fair die is rolled 50 times. X = number of times a 5 is rolled

The die is rolled 50 times, so $n = 50$ .

Each roll can have 6 outcomes. So the probability that 5 is rolled is $p = \frac{1}{6}$

(b) A company puts a game card in each box of cereal and 1/100 of them are winners. You buy sixteen boxes of cereal, and X = number of times you win.

You buy 16 boxes of cereal, so $n = 16$ .

1 of 100 are winners. So $p = \frac{1}{100}$ .

(c) Jack likes to play computer solitaire and wins about 25% of the time. X = number of games he wins out of his next 26 games.

He plays 26 games, so $n = 26$ .

He wins 25% of the time, so $p = 0.25$

We have that $\mu = np$ . So $\mu = 26*0.25 = 6.5$

6 0

4 years ago

Rewrite each subtraction problem as a addition problem x-156=279

Sauron [17]

Answer:

the answer is 123 123+156=279.

4 0

3 years ago

If you add Natalie's age and Fred's age, the result is . If you add Fred's age to times Natalie's age, the result is . Write

Reika [66]

Answer:

how old are they im confused

Step-by-step explanation:

8 0

3 years ago

Find the indicated area under the curve of the standard normal distribution; then covert it to a percentage and fill in the blan

Artemon [7]

99.74\ % hope this is correct and help !

5 0

3 years ago

Assume that 1200 births are randomly selected and exactly 595 of the births are girls. Use subjective judgment to determine whet

emmainna [20.7K]

Answer:

Lets assume that 1200 births are randomly selected and exactly 595 of the births are girls.

In percentage this is : $\frac{595}{1200}\times100=49.58\%$

This is approx 50%. We can say that almost random 50% are girls.

So, It is unlikely because the probability of this particular outcome is very small, considering all of the other possible outcomes.

Part B: It is not unusual because 595 is about the number of girls expected.

6 0

3 years ago