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
How would I solve 1 and 2?
Rus_ich [418]
For one you have to find the circumference of the which is 3.14 times diameter then divide 5280 which is a mile by the circumference that would be the answer

for two you have to take 1920 which is the 80 times 24, then take the circumference of the earth and divide it by 1920
7 0
2 years ago
What is the quotient of 99 divided by 9081
Artist 52 [7]

Hello from MrBillDoesMath!

Answer:

11/ 1009   (.0109 approximately)

Discussion:

99/9081 =                               => as 9081 = 9 * 1009 = 3 * 3 * 1009

99/ ( 3 * 3 * 1009)  =

(99/(3*3)) * (1/1009) =

(99/9)  * (1/1009)  =

11/ 1009 =

.0109 approximately


Thank you,

MrB

6 0
3 years ago
Read 2 more answers
Is that the answer please help no links no links please help
fenix001 [56]

Answer:

360

Step-by-step explanation:

V= L•W•H/3

10×12×9÷3

3 0
2 years ago
14) Simplify: -(16 - 5x) A) 5x - 16 B) 5x + 16 C) -5x - 16 D) - 5x + 16
VLD [36.1K]

Answer: 5x-16

<u>Switch operations</u>

Before: -(16 - 5x)

After: 5x-16

Before you switch operation you remove the subtraction sign where -(16) is.

5 0
3 years ago
A tortoise is walking in the desert. It walks at a speed of 2 meters per minute for 2.56 meters. For how many minutes does it wa
zaharov [31]

distance = rate * time

2.56 meters = 2meter/min * t

divide by 2 on each side

2.56/2 =t

1.28 minutes =t

8 0
2 years ago
Other questions:
  • 70 students at a school were asked to complete a survey about the location of their next field trip. 28 students chose the zoo a
    5·1 answer
  • Graph of a line containing the following points: (–4, –3) and (2, –3). Which is the equation of the given line?
    9·1 answer
  • Compare 4 x 10^6 and 2 x 10^7.
    7·1 answer
  • QUICK ANSWER PLEASE Evaluate for x = ─ 3 and y = 4. Problem is -1/2(2x-y)
    10·2 answers
  • Write a linear equation that goes through the points (0,4) and (4,10).
    10·2 answers
  • Miranda found out there are 20 drops in 1 mL of medicine. She measured 15 drops of medicine into a measuring cup. How many milli
    7·1 answer
  • What is the product of 2x+3 and 4x² - 5x+6?
    12·1 answer
  • Solve the following equation:<br> 1.3(a + 2) + 5.6 = 17.3
    7·1 answer
  • What do you divide 71.2 by to get 7120
    10·2 answers
  • Not Necessarily Congruent Congruent : B AABCAA by the D Choose On O Not Necessarily Congruent R M Congruent N AMNO A D by the P
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!