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m_a_m_a [10]
4 years ago
6

Let's say you take a 10 question multiple choice test. Each question has 4 choices and you guess on all of them. What is the pro

bability you get 7 or more right?
Mathematics
2 answers:
AURORKA [14]4 years ago
5 0

In a multiple choice question the probability of success is :  p = 1/4 = 0.25

and the probability of failure is : q = 3/4 =) 0.75

r = 7 ( correct answers )

Probability =  10 C r * ( 1/4 ) ^(10- r) * ˙( 3/4 )^r =

=  10 C 7 * ( 0.25 )^3 * ( 0.75 )^7 = 

= 120* 0,00208568572 =

= 0,2502822864

<u>Answer: Probability is 0,2502822864 or 25.02822864 %.</u>

iren2701 [21]4 years ago
3 0

Answer:25%

Step-by-step explanation:

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Simplify (3x − 8) + (2x + 5) − (4x − 8).<br> A) x − 11 <br> B) x + 5 <br> C) x + 21 <br> D) 9x + 5
lozanna [386]

Answer:

B

Step-by-step explanation:

3x-8+2x+5-4x+8

3x+2x-4x    -8+5+8

     x        +        5      

x+5

6 0
3 years ago
Read 2 more answers
Find the median of the data in the pictograph below. Caroline has 2. Samuel has 4. Abby has 4. Jason has 2
atroni [7]

Answer:

3

Step-by-step explanation:

The median is the central number of the data. Align numerically (2, 2, 4, 4) and find the center number. Since there are two, find the average of 2 and 4 to get 3. ([2+4]/2=3)

3 0
3 years ago
Read 2 more answers
Helppppp how do u do number 1?
VashaNatasha [74]
Only A
And only when x = 1

Nothing else works.
4 0
3 years ago
Solve for x. Show the equation you used and your work.
IgorC [24]
Here, You need to apply "Proportionality Theorem"
According to this theorem, the ratio of components of a leg would be equal to the ratio of corresponding components of another leg.

In mathematical form, 
TV/VS = TW/WU

Substitute their values, 
14/6 = 21/(x+4)
14(x+4) = 21*6
14x+56 = 126
14x = 126-56
x = 70/14
x = 5

In short, Your Answer would be 5

Hope this helps!
4 0
3 years ago
Can someone help me solve this?!​
vesna_86 [32]

Answer:

10x+2

Step-by-step explanation:

First we work on the paranthesis. We will times 5 and 2x to get 10x

and then we times 5 and 3/4 to get 3\frac{3}{4}

So now we have 10x+3\frac{3}{4}-1.75

Next, we subtract 3\frac{3}{4}-1.75 which is 2

Lastly we look at the equation as a whole!

10x+2

3 0
3 years ago
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