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Sergeu [11.5K]
3 years ago
13

Suppose that for a randomly selected high school student who has taken a college entrance exam, the probability of scoring above

650 is 0.30. A random sample of n = 10 students was selected. The mean μ of X, the number of students in the sample who have scores above 650 is ______.
Mathematics
1 answer:
Sophie [7]3 years ago
5 0

Answer:

3.0

Step-by-step explanation:

n=10

p=0.30

mean=np=10X0.3 = 3

That is it.

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A cooler has 12 apple juices and 15 grape juices. 9 of the apple juices are sugar free and 5 of the grape juices are sugar free.
Alexus [3.1K]

A - juice is not sugar free

B - juice is not grape juice


|\Omega|=27\\ |A|=13\\ |A\cap B|=3\\\\ P(A)=\dfrac{13}{27}\\ P(A\cap B)=\dfrac{3}{27}=\dfrac{1}{9}\\\\ P(B|A)=\dfrac{\dfrac{1}{9}}{\dfrac{13}{27}}=\dfrac{1}{9}\cdot\dfrac{27}{13}=\dfrac{3}{13}

So, it's D, assuming "3 13" meant \dfrac{3}{13}


5 0
3 years ago
Factorise the following completely: (4 marks)<br><br>a)a) 81
mojhsa [17]

Answer:

Learn the factors of 92, and the factors of 93, and the factors of 94.All three of these numbers are composite numbers

7 0
3 years ago
Read 2 more answers
Which data set is the most spread from its mean?
Digiron [165]

Answer:

Tha mean is 23 which means there is no answer:)

<u>14, 26, 24, 28:</u> still 23

<u>22, 16, 18, 36:</u>STILL 23

<u>22, 28, 20, 22: </u><u>23</u>

<u>21, 19, 27, 25:</u> STILL 23

6 0
3 years ago
Read 2 more answers
1. If 1/2 is added to three times the reciprocal of a number, the result is 1. Find the number.
Svetach [21]

Answer:

The number is 6

Step-by-step explanation:

Let's say that the reciprocal of the number is x

1/2 + 3 = 1

3x = 1/2

divided both sides by 3

x = 1/6

Since x is the reciprocal of the number, flip 1/6 and you will get 6/1

6/1 is really just 6 so that's your answer.

Hope this helps :)  

4 0
3 years ago
Mrs. Thomas bought 2/4 yard of one fabric and 3/4 yard of a different fabric. How many total yards of fabric did she buy?
natta225 [31]
It is 5/4 yards, you just add 
When the denominator ( the bottom number ) is the same, just add the numerator ( the top number ) together :) 
hope this help

8 0
3 years ago
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