What is the value of x
1 answer:
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Answer:
The length and width are
r-11 and r+5
Step-by-step explanation:
The given trinomial is
To factor, we need to split the middle term to get:
We now factor by grouping to obtain;
We collect common factors again to get:
Therefore the length and width are
r-11 and r+5
Answer:
a. [0.137, 0.503]
Step-by-step explanation:
In a sample with a number n of people surveyed with a probability of a success of , and a confidence interval
, we have the following confidence interval of proportions.
In which
z is the zscore that has a pvalue of .
For this problem, we have that:
A sample of 25 students in the lab, of whom 8 smoke. So
95% confidence interval
So , z is the value of Z that has a pvalue of
, so
.
The lower limit of this interval is:
The upper limit of this interval is:
The correct answer is:
a. [0.137, 0.503]