Answer:
1.791
Step-by-step explanation:
Confidence interval for normal distributions can be stated in the formula
M±zσ where
- M is the <em>sample mean</em>, which is 1.14
- z is the corresponding <em>z-score for 99% confidence (one-tailed)</em>, which is 2.326
- σ is the <em>standard deviation </em>of the sample, which is 0.28
Thus, 99% lower confidence bound on the true Izod impact strength is
1.14+(2.326*0.28) = 1.791
The answer to this is D.
The tricky part of this question is to determine the relationship between Lee's points and Alex's points.
From the description "Lee scored 25 points" we can be sure that Lee's points are 25. That's the easy part.
Here comes the real question. We need to change "that was 3 more than twice the number of points Alex scored" into an algebraic equation. From "twice the number of points Alex scored", we can know it's 2a, as Alex's points are represented by a and twice means 2 times. From "that's 3 more", we can determine that Lee has a higher point (25 larger than 2a by 3 points). So, Alex need to add a few more points in order to have the same value as Lee did.
Therefore, if we combine everything together, we can get 25 (Lee's points) = 3 + 2a (twice Alex's points plus 3 because Alex has less points). The answer is D.
There are problems like "what is the greatest number that you need" and those are the problems
Answer:
The Company AB must sell 116 computers to break even
Step-by-step explanation:
we have
-----> equation A
----> equation B
where
C is the cost function
R is the revenue function
x is the number of computers sold
we know that
Break even is when the cost is equal to the revenue
so
equate equation A and equation B
Solve for x
subtract 1/4x both sides
Divide by 1.25 both sides
therefore
The Company AB must sell 116 computers to break even