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Tamiku [17]
3 years ago
12

ANSWER ASAP I WILL GIVE BRAINIEST

Mathematics
2 answers:
Elza [17]3 years ago
7 0
A. The ratio is going to be 2:3
Vikentia [17]3 years ago
3 0
It is A because the ratio is 2:3
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cam hits the bullseye in 8 darts out of 15 throws. what is the experimental probability that came next throws will hit the bulls
Zigmanuir [339]

Answer:

A darts player practices throwing a dart at the bull’s eye on a dart board. Her probability of hitting the bull’s eye for each throw is 0.2.

(a) Find the probability that she is successful for the first time on the third throw:

The number F of unsuccessful throws till the first bull’s eye follows a geometric

distribution with probability of success q = 0.2 and probability of failure p = 0.8.

If the first bull’s eye is on the third throw, there must be two failures:

P(F = 2) = p

2

q = (0.8)2

(0.2) = 0.128.

(b) Find the probability that she will have at least three failures before her first

success.

We want the probability of F ≥ 3. This can be found in two ways:

P(F ≥ 3) = P(F = 3) + P(F = 4) + P(F = 5) + P(F = 6) + . . .

= p

3

q + p

4

q + p

5

q + p

6

q + . . . (geometric series with ratio p)

=

p

3

q

1 − p

=

(0.8)3

(0.2)

1 − 0.8

= (0.8)3 = 0.512.

Alternatively,

P(F ≥ 3) = 1 − (P(F = 0) + P(F = 1) + P(F = 2))

= 1 − (q + pq + p

2

q)

= 1 − (0.2)(1 + 0.8 + (0.8)2

)

= 1 − 0.488 = 0.512.

(c) How many throws on average will fail before she hits bull’s eye?

Since p = 0.8 and q = 0.2, the expected number of failures before the first success

is

E[F] = p

q

=

0.8

0.2

= 4.

7 0
3 years ago
Read 2 more answers
Which of the following is the graph of the equation y = 2x + 3
Mandarinka [93]
Y=2x+3
put x =0 onetime then y=3
now put y =0  2x+3
x= -3/2

3 0
3 years ago
Read 2 more answers
peter keeps his pigs in a pen with a length of x+9 and a width of x-2. what is the area of peters pig pen
Vadim26 [7]

Step-by-step explanation:

my answer is x-7

hmmm.. I hope its correct#

5 0
3 years ago
The lines shown below are perpendicular. If the green line has a slope of 2/5 what is the slope of the red line
Ksenya-84 [330]
In this item, we are not given with the figure but knowing that these lines ought to be perpendicular then we will be able to derive the relationship between the slopes of the line. 

The slopes of the perpendicular line are the negative reciprocals of one another. If we represent the slopes of the lines as m₁ and m₂, the relationship can be written in the form,
           (m₁)(m₂) = -1

We are given with one of the slopes. To determine the value of the second slope then,
            m₂ = -1/m₁
            m₂ = -1/(2/5)
            m₂ = -5/2

<em>ANSWER: m₂ = -5/2</em>
6 0
3 years ago
A coin is biased to show 39% heads and 61% tails. The coin is tossed twice. What is the probability that the coin turns up tails
julia-pushkina [17]
I'm pretty sure that this is a trick question, the answer is 61%.
7 0
3 years ago
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