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Kay [80]
3 years ago
13

In a destructive test of product quality, a briefcase manufacturer places each of a simple random sample of the day’s production

in a viselike device and measures how many pounds it takes to crush the case. From past experience, the standard deviation has been found to be 21.5pounds. For 35 cases randomly selected from today’s production, the average breaking strength was 341.0 pounds. The lower confidence limit of 99% confidence interval for the mean breaking strength of the briefcases produced today would equal to;
Mathematics
1 answer:
Pepsi [2]3 years ago
6 0

Answer:

The lower confidence limit of 99% confidence interval for the mean breaking strength of the briefcases produced today would be equal to 331.09 pounds.

Step-by-step explanation:

Lower limit of confidence interval = mean - Error margin (E)

mean = 341.0 pounds

sd = 21.5 pounds

n = 35

degree of freedom = n - 1 = 35 - 1 = 34

confidence level = 99%

t-value corresponding to 34 degrees of freedom and 99% confidence level is 2.728

E = t × sd/√n = 2.728 × 21.5/√35 = 9.91 pounds

Lower limit = 341.0 - 9.91 = 331.09 pounds

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lana66690 [7]

Answer:

y= -9+√122, or -9 - √122

Step-by-step explanation:

You have to solve the equation for y to find each variable of the quadratic and applying the quadratic formula.

after solved, I got the answer as decimal,

y = 2.0453610.....

i simpler form : y = 2.05

Also, an answer can be y= -9+√122, or -9 - √122

6 0
2 years ago
It takes two apples to make an apple pie. If a chef bought nine apples, the last pie
defon

Hey!

-------------------------------------------------

If a chef bought 9 apples and each pie takes 2 apples then all we have to do is divide.

9 / 2 = 4.5

4 full pies can be made with 9 apples.

4 x 2 = 8 (apples were used to make 4 pies.)

9 - 8 = 1 (apple remaining)

If one pie needs 2 apples, subtract.

2 - 1 = 1 (pies the chef needs to make the last one)

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Answer: The last pie would need 1 more apple.

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Hope This Helped! Good Luck!

5 0
2 years ago
Rex mixed x liters of fruit syrup with y liters of water to make a fruit punch. Three times the number of liters of water he mix
irga5000 [103]
3y = 2x + 6
x + y = 7

y = 7 - x
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x + y = 7
3 + y = 7
y = 7 - 3
y = 4

Solution is (3,4)

6 0
3 years ago
Read 2 more answers
Pleaseeee help!!
kkurt [141]

Answer:

answer is A. cosine

Step-by-step explanation:

8 0
2 years ago
A group of students and teachers are going on a field trip? One ninth of the group will fit on 1/3 of a school bus. How many bus
solniwko [45]
3/9 will fit on one bus so it will take 3 buses to fit 9/9 of the students, which 9/9 is the whole group.
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3 years ago
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