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m_a_m_a [10]
3 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]3 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]3 years ago
3 0

Answer:25%

Step-by-step explanation:

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Step-by-step explanation:

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3 years ago
Describe the dimensions of two different prisms that each have a volume of 2,400 cubic centimeters
taurus [48]
<span>1) 20 cm by 20 cm by 6 cm
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3 years ago
Read 2 more answers
I GIVE BRAINLIEST PLS HELP
ioda
The answer is 8
Here's why:
{ ( \frac{( {6}^{7}) \times ( {3}^{3})  }{(  {6}^{6}) \times ( {3}^{4}  ) } )}^{3}  =   \\ ( \frac{6}{3} ) ^{3}  =  \\ \frac{216}{27}  = 8
The exponents are subtracted one from another when divided.
\frac{ a ^{b} }{ {a}^{c} } =  {a}^{b - c}
We can look at the problem this way:
( \frac{6^{7} }{6 ^{6} }  \times  \frac{3^{3} }{ {3}^{4} } ) = (6^{7 - 6}  \times  {3}^{3 - 4} ) =  \\ ({6}^{1}  \times  {3}^{ - 1} )
Since we have the power of -1 on the 3, we apply this rule:
{a}^{ - b}  =  \frac{1}{ {a}^{b} }
Also this rule because we have the power of 1 on the 6:
{a}^{1}  = a
Then we get this:
(6 \times  \frac{1}{3} )^{3}  = ( \frac{6}{3} )^{3}
We apply the rule:
( \frac{a}{b}) ^{c}   =  \frac{ {a}^{c} }{ {b}^{c} }
We get this:
\frac{{6}^{3} }{ {3}^{3} } =  \frac{216}{27}  = 8
4 0
3 years ago
You purchase 5 pounds of apples and 2 pounds of oranges for $9.Your friend purchases 5 pounds of apples and 6 pounds of oranges
babymother [125]

Answer:

x = 1 and y = 2

Step-by-step explanation:

Let apples are represented by x

and let oranges are represented by y

You purchase 5 pounds of apples and 2 pounds of oranges for $9. This line in equation format can be written as:

5x + 2y = 9

Your friend purchases 5 pounds of apples and 6 pounds of oranges for $17.

This line in equation format can be written as:

5x + 6y = 17

Now we have two equations:

5x + 2y = 9 -> eq (i)

5x + 6y = 17 -> eq(ii)

We can solve these equations to find the value of x and y.

Subtracting eq(i) from eq(ii)

5x + 6y = 17

5x + 2y = 9

-     -         -

_________

0+4y= 8

=> 4y = 8

y= 8/4

y = 2

Now, putting value of y in eq (i)

5x + 2y = 9

5x +2(2) = 9

5x +4 = 9

5x = 9-4

5x = 5

x = 1

so, x = 1 and y = 2

8 0
3 years ago
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Gala2k [10]
Since the values are the same on both sides the matrix value is a=1
7 0
3 years ago
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