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Vladimir79 [104]
3 years ago
10

Need help!!!!!!!!!!!!!!

Mathematics
1 answer:
lisov135 [29]3 years ago
6 0
It is the last answer that is the correct one 

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In the Central City Grand Prix, out of 30 cars that started the race, 12 of them finished. What percent of the cars finished the
snow_lady [41]
To get the answer we can use proportion.
30----------100%
12-----------x
Cross multiply now
30x=12*100%
30x=1200% /:30 (divide both sides by 30)
x=40% - it's the percentage of cars which finished the race.
100%-40%=60% - it's the answer
3 0
3 years ago
The number of tickets purchased by an individual for Beckham College's holiday music festival is a uniformly distributed random
Zanzabum

1) Mean: 6.5

2) Standard deviation: 3.2

Step-by-step explanation:

1)

A uniform random distribution is the distribution of a variable that can assume n different values, and each of these values is equally likely to occur.

This means that the probability of occurring of each of these values is the same:

p(x_1)=p(x_2)=...=p(x_n)

For a uniform random distribution, the mean of the distribution is simply equal to the median value of the distribution, which is exactly at the center of the distribution itself. It can be calculated as

\bar x = \frac{1}{2}(a+b)

where

a is the lowest value of the distribution

b is the highest value of the distribution

Here the distribution consists of all values ranging from 1 to 12, so:

a = 1

b = 12

Therefore the mean value is

\bar x=\frac{1}{2}(1+12)=6.5

2)

For a uniform random distribution, it can be dimostrated that the variance of the distribution is

\sigma^2 = \frac{1}{12}(b-a)^2

For the distribution in this problem, we have:

a = 1

b = 12

Therefore the variance is

\sigma^2 = \frac{1}{12}(12-1)^2=10.08

The standard deviation is the square root of the variance, therefore for this distribution it is:

\sqrt{\sigma^2}=\sqrt{10.08}=3.2

Learn more about mean and standard deviation:

brainly.com/question/6073431

brainly.com/question/8799684

brainly.com/question/4625002

#LearnwithBrainly

3 0
3 years ago
Please help answer questions 1 and 2!
Mariulka [41]

Answer:

1:A

3:C

hope this help

4 0
3 years ago
A right angle has an area of 13m*2. The dimensions of the triangle are increased by a scale factor of 3. What is the area of the
Alex_Xolod [135]

The answer is: 117m²

The explanation is shown below:

1. You have the following information given in the problem:

- The triangle has an area of 13 m².

- The dimensions of the triangle are increased by a scale factor of 3.

2. Therefore, to solve the exercise you must multiply the area by 3^{2}=9, as following:

A=(13m^{2})(9)\\A=117m^{2}

5 0
3 years ago
2. What is 95% of 720?​
jek_recluse [69]

Answer: 684

Step-by-step explanation:

95% of 720

Move decimal point two places to the right.

0.95 * 720 = 684

5 0
3 years ago
Read 2 more answers
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