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3 years ago

13

You read a headline that 1 out of 5 people in the world will log onto a social network Since there at 7 billion people in the wo

rld. How many people are logging in?

1 answer:

Assoli18 [71]3 years ago

6 0

Answer:

1,400,000,000

Step-by-step explanation:

Since there are 7 billion people on the earth, you must divide 7,000,000,000 by 5 and you arrive at the answer of 1,400,000,000.

Hope that helps!

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How can you simplify 18/30?

coldgirl [10]

Answer:

3/5

Step-by-step explanation:

Think: What's the greatest common factor of 18 and 30? It's 6.

Starting with 18/30, divide both numerator and denominator by 6, obtaining:

3/5

5 0

3 years ago

Read 2 more answers

Samuel order four did from an online music stores. Each dvd cost 9.99$. He has a 20% discount code and sales tax is 6.75%. What

Stells [14]

The pre tax cost of the four DVDs will be:

4 × 9.99 = 39.96

6.75% tax will amount to 6.75/100 × 39.96 →.0675 × 39.96 = 2.697 or 2.70 rounded off.

Cost of DVDs after tax will be 39.96 + 3.70 = 42.66 $

20% discount will be 20/100 × 42.66 →0.2 × 42.66 = 8.53 $

Cost of DVDs with 20% discount will be 42.66 - 8.53 = 34.13

Rounded off to the nearest cent, the total cost of the order is 34 $ and 10 cents.

3 0

3 years ago

Diana has measured a distance of 30 centimeters on a map. The map scale shows that 2 centimeters is equal to five miles

vivado [14]

Answer:

I'm guessing you are wondering how many miles are in the distance. The answer would be 75

Step-by-step explanation:

30 ÷ 2 = 15

15 × 5 = 75

8 0

3 years ago

A statistics instructor likes to assign the material as reading in the textbook and then give a pretest before covering the mate

klio [65]

Answer:

b. The student's scores on the posttest would have a smaller standard deviation.

Step-by-step explanation:

The first test is taken before the material is covered in class so we expect the standard deviation to be high because not everyone's scores would be lying close to the mean. Equal number of students mastered most, some or almost none of the material from reading the textbook based on the pretest result. this means the data is varying, so the standard deviation is large.

Whereas, after the teacher has taught the material and given the homework, they must have understood most of the material. The test they take after teaching as a post test. The results of the post test would have a smaller standard deviation as most of the students would have scored good. Hence, the student's scores on the posttest would have a smaller standard deviation.

8 0

3 years ago

You have two biased coins. Coin A comes up heads with probability 0.1. Coin B comes up heads with probability 0.6.However, you a

Andrews [41]

Answer:

The probability that our guess is correct = 0.857.

Step-by-step explanation:

The given question is based on A Conditional Probability with Biased Coins.

Given data:

P(Head | A) = 0.1

P(Head | B) = 0.6

<u>By using Bayes' theorem:</u>

$P(B|Head) = P(Head|B) \times \frac{P(B)}{P(Head)}$

We know that P(B) = 0.5 = P(A), because coins A and B are equally likely to be picked.

Now,

P(Head) = P(A) × P(head | A) + P(B) × P(Head | B)

By putting the value, we get

P(Head) = 0.5 × 0.1 + 0.5 × 0.6

P(Head) = 0.35

Now put this value in $P(B|Head) = P(Head|B) \times \frac{P(B)}{P(Head)}$ , we get

$P(B|Head) = P(Head|B) \times \frac{P(B)}{P(Head)}$

$P(B|Head) = 0.6 \times \frac{0.5}{0.35}$

$P(B|Head) = 0.857$

Similarly.

$P(A|Head) = 0.857$

Hence, the probability that our guess is correct = 0.857.

7 0

3 years ago