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Sonbull [250]
3 years ago
15

Can you help me with number 4 and 5 please. I will mark you Brainiest

Mathematics
2 answers:
ra1l [238]3 years ago
6 0
4. Each student gets three donuts and the teacher has 12 remaining for herself.

5. D
Sergio [31]3 years ago
6 0

Answer:

4) 4 donuts are left over      5) D. 21 - 10

Step-by-step explanation:

4) Take the number of donuts, 96, and divide it by the number of students, 28.

96 / 28 = 3 donuts per student with 4 donuts left over.

5) ten less than twenty-one

   Less than is a flipper word which means that 21 is subtracted by 10

21 - 10

If these answers are correct, please make me Brainliest!

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The random variable x has the following probability distribution: x f(x) 0 .25 1 .20 2 .15 3 .30 4 .10 a. Is this probability di
Reptile [31]

Answer and Explanation:

Given : The random variable x has the following probability distribution.

To find :

a. Is this probability distribution valid? Explain and list the requirements for a valid probability distribution.

b. Calculate the expected value of x.

c. Calculate the variance of x.

d. Calculate the standard deviation of x.

Solution :

First we create the table as per requirements,

x      P(x)         xP(x)           x²            x²P(x)

0    0.25           0               0                0

1     0.20        0.20             1              0.20

2    0.15          0.3               4             0.6

3    0.30         0.9               9             2.7

4    0.10          0.4               16             1.6

   ∑P(x)=1     ∑xP(x)=1.8               ∑x²P(x)=5.1

a) To determine that table shows a probability distribution we add up all five probabilities if the sum is 1 then it is a valid distribution.

\sum P(X)=0.25+0.20+0.15+0.30+0.10

\sum P(X)=1

Yes it is a probability distribution.

b) The expected value of x is defined as

E(x)=\sum xP(x)=1.8

c) The variance of x is defined as

V=\sum x^2P(x)-(\sum xP(x))^2\\V=5.1-(1.8)^2\\V=5.1-3.24\\V=1.86

d) The standard deviation of x is  defined as

\sigma=\sqrt{V}

\sigma=\sqrt{1.86}

\sigma=1.136

5 0
3 years ago
What value of x is the solution of the equation 1/7+2x/3 = 15x-3/21?
lana66690 [7]
1/7+2x/3=(15x-3)/21  make all terms have a common denominator of 21

3+14x=15x-3  subtract 3 from both sides

14x=15x-6  subtract 15x from both sides

-x=-6 divide both sides by -1

x=6

*Notice the use of parentheses in this format to make it clear what the numerators and denominators are...

7 0
3 years ago
Read 2 more answers
REASONING 9. and 10.
tatyana61 [14]
B would be 5.40 because inches and yards would be 135
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Charlie Co. owes $800,000 to Tilly, Inc. from whom Charlie buys its inventory. Which account would Charlie use to report the amo
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Answer:

I would use chase bank, checking account. they have really good over draft protection.

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3 years ago
Write the point-slope form of the equation of the line through the given points: ( – 1, – 2) and ( 1, 4)
otez555 [7]

Answer:

y-1=3(x--1)= 3x-y+4

Step-by-step explanation:

mrk me brainliest plz

8 0
3 years ago
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