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2 years ago

I'm thinking of a number. When you triple my number and subtract 8 you get 7. What is my number?

Mathematics

2 answers:

CaHeK987 [17]2 years ago

7 0

So here, just work backwards:

7+8=15
15/3=5

Alja [10]2 years ago

5 0

3a - 8 = 7
3a (-8 + 8) = (7+8)
3a = 15
(3a/3) = (15/3)
a = 5
The answer is 5

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Which probability distribution table corresponds with this frequency distribution table

nlexa [21]

Answer:

$\begin{array}{cccccc}x&1&2&3&4&5\\f&0.2&0.3&0.05&0.2&0.25\end{array}$

Step-by-step explanation:

First find the sum

$\sum f=4+6+1+4+5=20.$

Now, find the probabilities:

$Pr(x=1)=\dfrac{4}{20}=\dfrac{1}{5}=0.2;$
$Pr(x=2)=\dfrac{6}{20}=\dfrac{3}{10}=0.3;$
$Pr(x=3)=\dfrac{1}{20}=0.05;$
$Pr(x=4)=\dfrac{4}{20}=\dfrac{1}{5}=0.2;$
$Pr(x=5)=\dfrac{5}{20}=\dfrac{1}{4}=0.25.$

Hence, the frequency distribution table is

$\begin{array}{cccccc}x&1&2&3&4&5\\f&0.2&0.3&0.05&0.2&0.25\end{array}$

4 0

2 years ago

The volume of the prism is 900 cubic centimeters. The height of the prism is 15 centimeters and the height of the triangular bas

NeTakaya

900=(1/2)*b*10*15
1800=150b
b=12
I hope you can figure out FC with this info.

7 0

2 years ago

Read 2 more answers

Xyz^(2) if x=2 y=7 and z=-4

Afina-wow [57]

Answer:

-224

Step-by-step explanation:

xyz^2

(2)(7)(-4)^2

14 x -16

-224

8 0

2 years ago

Find the missing values<br> 3:4=6:__=9:_=12:_=15:_

Dahasolnce [82]

Step-by-step explanation:

6:8=9:12=12:16=15:20

5 0

2 years ago

A multiple choice test has four possible answers for each question. Let X be the number of correct responses in a test of 100 qu

dimulka [17.4K]

Answer:

a. 4.33.

Step-by-step explanation:

If there is only one correct answer out of four alternatives, the expected proportion of correct answers is p =0.25

Sample size (n) = 100 questions

The standard deviation of a proportion 'p' is given by:

$s=\sqrt{\frac{p*(1-p)}{n} }$

Applying the given data:

$s=\sqrt{\frac{0.25*(1-0.25)}{100}}\\s=0.0433$

If X is the number of correct responses in 100 guesses, the standard deviation of X is:

$\sigma = n*s=100*0.0433\\\sigma = 4.33$

The standard deviation of X is 4.33 questions.

7 0

2 years ago