1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
vaieri [72.5K]
3 years ago
7

At a new exhibit in the museum of science, people are asked to choose between 90 or 120 random draws from a machine. The machine

is known to have 93 green balls and 65 red balls. After each draw, the color of the ball is noted and the ball is put back for the next draw. You win a prize if more than 65% of the draws result in a green ballCalculate the probability of getting more than 65% green balls.(Round intermediate calculations to 4 decimal places, "z" value to 2 decimal places, and final answer to 4 decimal places.) n Probability90 120
Mathematics
1 answer:
Serga [27]3 years ago
8 0

Answer:

There is a probability of P₉₀=0.09853 of winning the prize with a 90-balls sample.

There is a probability of P₁₂₀=0.0853 of winning the prize with a 120-balls sample.

Step-by-step explanation:

In this problem, the balls that are removed are then replaced in the total, so the probability of obtaining a green ball is constant and is equal to:

P_g=\frac{93}{93+65}= 0.5886

This type of sampling should be analyzed with the binomial distribution, but given the sample size, it is convenient to use the approximation to a normal distribution.

The parameters of the normal distribution are:

\mu=P_g*n=0.5886*90=52.9746\\\\\sigma=\sqrt{np(1-p)}=\sqrt{90*0.5886*(1-0.5886)} =4.6684

To win the prize it is needed at least 65% of green balls in the sample, which means there have to be at least 59 green balls in the sample:

0.65*90=58.5

To calculate the probability of getting 59 or more green balls, we have to calculate the z-value

z=\frac{x-\mu}{\sigma}=\frac{59-52.9746}{4.6684}= 1.29

Then, the probability can be look up with the z-value in a normal distribution table:

P(X \geq  59)=P(z\geq 1.29)=0.09853

There is a probability of P=0.09853 of winning the prize with a 90-balls sample.

When the sample is of 120 balls, we have to recalculate the parameters.

Normal distribution

\mu=P_g*n=0.5886*120=70.6320\\\\\sigma=\sqrt{np(1-p)}=\sqrt{120*0.5886*(1-0.5886)} =5.3905

To win the prize it is needed at least 65% of green balls in the sample, which means there have to be at least 78 green balls in the sample:

0.65*120=78

To calculate the probability of getting 78 or more green balls, we have to calculate the z-value

z=\frac{x-\mu}{\sigma}=\frac{78-70.6320}{5.3905}=1.37

Then, the probability can be look up with the z-value in a normal distribution table:

P(X \geq 78 )=P(z\geq 1.37)=0.0853

There is a probability of P=0.0853 of winning the prize with a 120-balls sample.

You might be interested in
GIVING OUT BRAINLIST ASAP
rosijanka [135]

Answer:

$276.25

Step-by-step explanation:

325 * 0.85 = 276.25

5 0
2 years ago
Read 2 more answers
Linda has a part-time job at the school. She makes between 44.00 and $51.00 a dayWhich is a reasonable estimate of the amount of
Luba_88 [7]

Answer:

$285

Step-by-step explanation:

The mode of 44 and 51 is 47.50 and 47.50 x 6 equals 285

6 0
3 years ago
Can someone tell me the answer I’ve literally have been really needing to know this answer plsss and thank you
Sliva [168]

It is C..........................Happy Birthday


5 0
3 years ago
How May I Draw My number Line And Where Would My Numbers Go?
Digiron [165]
.5 is basically 1/2. We know this because .5 written as a fraction is 50/100 which you can simplify to 1/2.

6/10 is greater than 1/2. You can find this out by converting 1/2 to tenths. Multiply the numerator and the denominator by 5 to get 5/10. From there you can easily see that 6/10 > 5/10.

As for the number line simply use 10ths: 1/10, 2/10, 3/10 ... and input 6/10 and 5/10 in the appropriate areas.
4 0
3 years ago
If QRST is a rectangle with QT = 30 and RS = 4x + 10, find x.
ArbitrLikvidat [17]
The opposite side pairs in a rectangle are congruent, so basically QT would be congruent to RS when you draw the rectangle and label the points.
4x+10=30
4x=20
x=5
4 0
3 years ago
Other questions:
  • F(x)=-11x-2 and g(x) =7x-4 find (f°g)(x)​
    7·1 answer
  • What is a simpler form of the following expressions?
    14·1 answer
  • In ΔQRS, the measure of ∠S=90°, the measure of ∠Q=29°, and RS = 83 feet. Find the length of SQ to the nearest tenth of a foot.
    11·1 answer
  • 3 + 10.8 is:<br> rational<br> irrational<br> Idk what this is if u could please help me
    9·1 answer
  • 20 POINTS PLEASE HELP
    13·1 answer
  • What is the measurement of angle ABC?
    11·1 answer
  • What is 9z + 2z -8 equivalent to after being simplified?
    9·2 answers
  • A fan buys a copy of the trials latest CD the CD cost $11.64 is paid for with a $20 bill how much change will be given
    13·2 answers
  • 2.
    6·1 answer
  • Solve the equations: 4x - 6 = 6 - 2x , 3(x - 4) = 5​
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!