Answer:
The 80% confidence interval for the mean usage of water is between 18.4 and 18.6 gallons per day.
Step-by-step explanation:
We have that to find our 
level, that is the subtraction of 1 by the confidence interval divided by 2. So:
Now, we have to find z in the Ztable as such z has a pvalue of 
.
So it is z with a pvalue of 
, so 
Now, find the margin of error M as such
In which 
is the standard deviation of the population and n is the size of the sample.
The lower end of the interval is the sample mean subtracted by M. So it is 18.5 - 0.1 = 18.4 gallons per day.
The upper end of the interval is the sample mean added to M. So it is 18.5 + 0.1 = 18.6 gallons per day.
The 80% confidence interval for the mean usage of water is between 18.4 and 18.6 gallons per day.
Answer:
8/9 is greater than 5/6
Step-by-step explanation:
Steps for comparing fractions
Find the least common denominator or LCM of the two denominators:
LCM of 9 and 6 is 18
For the 1st fraction, since 9 × 2 = 18,
8
/9 =
8 × 2
= 16
9 × 2 = 18
Likewise, for the 2nd fraction, since 6 × 3 = 18,
5
/6 = 5 × 3
6 × 3 = 15
/18
Since the denominators are now the same, the fraction with the bigger numerator is the greater fraction
16
/18 > 15
/18 or 8
/9 > 5
/6
What do u mean I’ll answer I just don’t understand wht u mean
Answer:
5/4
Step-by-step explanation:
I think this makes sense, if this is what ur asking for.
