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Kitty [74]
3 years ago
12

Megan answered 18 questions correctly on a test. That is 75% of the total number of questions how many questions were on the tes

t?
Mathematics
1 answer:
ivolga24 [154]3 years ago
8 0
Ok so if u know a percent you multiply but you turn your 75 to a decimal so it would be 0.75•18
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Pls help asap due tomorrow
Svet_ta [14]

Based on the information given, it should be noted that the least number of marbles that can be in the bag will be 10 marbles.

<h2>Solution to the probability.</h2>

If the bag contains 60 marbles, the number of red marbles will be:

= 1/5 × 60

= 12 marbles.

The number of white marbles will be:

= 3/10 × 60

= 18 marbles.

The number of blue marbles will be:

= 60 - (12 + 18)

= 60 - 30

= 30 marbles.

Furthermore, when the bag has 4 red marbles and 6 white marbles, there'll be 10 blue marbles.

Lastly, to find the probability of choosing a blue marble, we've to multiply 1/2 by the number given.

Learn more about probability on:

brainly.com/question/25870256

4 0
3 years ago
The ages of registered voters in Smith County are normally distributed with a population standard deviation of 3 years and an un
eimsori [14]

Answer:

The margin of of error for a 95% confidence interval for the population mean is of 1.39 years.

Step-by-step explanation:

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1 - 0.95}{2} = 0.025

Now, we have to find z in the Ztable as such z has a pvalue of 1 - \alpha.

That is z with a pvalue of 1 - 0.025 = 0.975, so Z = 1.96.

The margin of error is:

M = z\frac{\sigma}{\sqrt{n}}

In which \sigma is the standard deviation of the population and n is the size of the sample.

Population standard deviation of 3 years

This means that \sigma = 3

Sample of 18 voters

This means that n = 18

Margin of error:

M = z\frac{\sigma}{\sqrt{n}}

M = 1.96\frac{3}{\sqrt{18}}

M = 1.39

The margin of of error for a 95% confidence interval for the population mean is of 1.39 years.

3 0
3 years ago
Winnie wrote the following riddle.I am a number between 60 and 100.My ones digit is two less than my tens digit.I am a prime num
Kazeer [188]

Answer:

79

Step-by-step explanation:

60<xy<100

y -2 =x


if it is prime

y cannot be even

so y could be      1,3,5,7,9

x would then be 9,1,3,5,7

but to be between 60 and 100

x must be 7 or 9

so the number must be 79 or 57

57 is not prime so

the number is 79

5 0
3 years ago
Ashley wants to divide her 63 shirts into two groups, so that the ratio of the number of shirts in the first group to the number
german
27 in the first group, 36 in the second. Here's the work: Divide 63 by 7 (3 parts plus 4 parts) equals 9. Multiply 9 by 3 for the first group and you get 27, multiply 9 by 4 for the second group to get 36.
8 0
4 years ago
X+x+x+x+3 simplified
aleksklad [387]

Answer:

4x + 3

Explanation:

x + x + x + x + 3

There are 4 x's

Simplify 4 x's to 4x

4x + 3

4 0
4 years ago
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