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OLEGan [10]
3 years ago
8

Someone answer these for me please

Mathematics
1 answer:
goblinko [34]3 years ago
8 0

Answer:

1. 20%

2. 13 and 14

3. 52q

4. option 1

5. option 3

6. 6

Hope this helped :)

Step-by-step explanation:

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You tell your 3 friends that you are going to a magic show. It turns out, in an amazing coincidence, they each
Inga [223]

Answer:

\frac{1}{4845} probability that you and your 3 friends will be selected.

Step-by-step explanation:

A probability is the number of desired outcomes divided by the number of total outcomes.

In this question, the order in which the volunteers are chosen is not important, which means that the combinations formula is used to solve this question.

Combinations formula:

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)!}

Desired outcomes:

You and the 3 friends(4 people), from a set of 4. So

D = C_{4,4} = \frac{4!}{4!0!} = 1

Total outcomes:

20 people from a set of 20. So

T = C_{20,4} = \frac{20!}{4!16!} = 4845

Probability:

p = \frac{D}{T} = \frac{1}{4845}

\frac{1}{4845} probability that you and your 3 friends will be selected.

8 0
3 years ago
If the standard deviation of a normally distributed population is 22.0 and we take a sample of size 4 then the standard error is
lawyer [7]

Answer:

The standard error is 11.

Step-by-step explanation:

Given : If the standard deviation of a normally distributed population is 22.0 and we take a sample of size 4.

To find : The standard error ?

Solution :

The standard error formula is

SE=\frac{\sigma}{\sqrt{n}}

Where, \sigma=22 is the standard deviation of a normally distributed population

n=4 is the sample size

Substitute the value,

SE=\frac{22}{\sqrt{4}}

SE=\frac{22}{2}

SE=11

Therefore, the standard error is 11.

7 0
4 years ago
What is the probability of rolling an even number on a standard number cube and then rolling a one
expeople1 [14]

Answer:

multiply the chances

1/2 (every other number is even right)

1/2 x 1/6 (if it is a normal dice) = 1/12

1/12 chance

Step-by-step explanation:

4 0
3 years ago
The formula F = 1.8C + 32 is used to convert temperatures from degrees Celsius, °C, to degrees Fahrenheit, °F. Find the temperat
lapo4ka [179]

Answer:

68F

Step-by-step explanation:

Given data

The formula F = 1.8C + 32

we want to find F for C= 20°C

Substitute into the formula we have'

F = 1.8(20) + 32

F=36+32

F=68

Hence the value of 20°C in Fahrenheit is 68F

3 0
3 years ago
Which lines are parallel? justify your answer
Salsk061 [2.6K]
A is the answer :) hope I helped
3 0
3 years ago
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