Suppose that 30% of all students who have to buy a text for a particular course want a new copy (the successes!), whereas the other 70% want a used copy. Consider randomly selecting 15 purchasers.The bookstore has 10 new copies and 10 used copies in stock.
If 15 people come in one by one to purchase this text, what is the probability that all 15 will get the type of book they want from current stock?
Answers
Answer:
The probability that all 15 will get the type of book they want from current stock is 0.4838.
Step-by-step explanation:
Denote the random variable Xas the number of students who want to buy new copy.
The probability of a student wanting to buy a new copy is, P (X) = p = 0.30.
A random sample of n = 15 students is selected.
The random variable X follows a Binomial distribution.
The probability function of a Binomial distribution is:
It is provided that the bookstore has 10 new copies and 10 used copies in stock.
All the 15 students get their desired copy, then this can happen if at most 10 want to buy new copy and at least 5 wants to buy used copy.
Compute the probability of (5 ≤ X ≤ 10) as follows:
P (5 ≤ X ≤ 10) = P (X = 5) + P (X = 6) + P (X = 7) + P (X = 8) + P (X = 9) + P (X = 10)
Thus, the probability that all 15 will get the type of book they want from current stock is 0.4838.
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Suppose a candy connoisseur opened a random bag of candy and found that 15 of the 62 candies were red. Using this information, determine the margin of error that would be used to construct a 95% confidence interval for the proportion of all candies that are red. Please give the answer in decimal form precise to three decimal places.
in 2005 a company spent 493,749,335 on advertising. round the advertising figure to the nearest hundred thousand.
What number should I multiply 1 1/4 by to get 7/12
Answers
Answer:
10
Step-by-step explanation:
In this problem we need to round off 8.546 to the nearest tens. 8 is in ones place, 5 is in tenths place, 4 is in hundredths place and 6 is in thousandth place.
8 falls between 5 and 10 on the number line. It is less than 5 and more than 10. When it is rounded off to nearest tens it can be given by 10.
To round 8.546 to the nearest tens, the answer is 10.
To round 8.546 to the nearest tens, you need to look at the digit in the ones place, which is 6.
Since 6 is greater than or equal to 5, you round up the tens digit, which is 4.
Therefore, the final answer is 10.
Learn more about rounding here:
#SPJ3
Answers
Step-by-step explanation:
2/5 = 0.4 pool per hour
When multiplied by 25 hours
0.4 x 25 = 10
He can clean 10 pools in 25 hours
Answer:
qwerwertyuwerth
Step-by-step explanation:
1ettfgghhjjj just tryna get points
Find the number of sides of this polygon.
Answers
Answer:
45 sides
Step-by-step explanation:
If each of the interior angles is 172 degrees, then each of the exterior angles is 8 degrees. Since the sum of the exterior angles of any polygon is 360 degrees, there are 360 / 8 = 45 exterior angles and 45 sides.
Answers
Answer:
y=3x-2
Step-by-step explanation:
You can verify it's not D because the y-intercept is at -2.
You can verify it's not A because that would mean the x-intercept is 2 despite it appearing to be closer to one.
You can verify it's not B because that would mean the x-intercept is 1.5
Answers
Answer:
32 weeks
Step-by-step explanation:
First you should write an equation for this word problem. Since you know Brian wants to save to $200, the equation will equal 200. Then you figure out how much he has already, which is 88. Right now, the equation we have is 88+(weekly savings)= 200. He saves 3.50 a week, so the equation will finally look like 88+3.50x=200. X is how many weeks it will take for him to reach 200. We then move everything so that it all equals X. You would move the 88 first which will then give 3.50x=112. Dividing by 3.50 on both sides would give X as 32. SO the number of weeks it will take for Brian to save to $200 is 32 weeks.