Meyer will need 15 loads of gravel to cover his entire driveway.
Answer:
The 80% confidence interval for the mean number of toys purchased each year is between 7.5 and 7.7 toys.
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 .
That is z with a pvalue of , so Z = 1.28.
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 7.6 - 0.1 = 7.5
The upper end of the interval is the sample mean added to M. So it is 7.6 + 0.1 = 7.7
The 80% confidence interval for the mean number of toys purchased each year is between 7.5 and 7.7 toys.
Answer:
5 mins
Step-by-step explanation:
680/4
=170 meters (quarter of 680m)
170/34
=5 mins
2508(1+0.04)^24 = 6,428. trust me, found it to 6,019.20.
b.
Answer:
131072
Step-by-step explanation:
Let's put it into expression form and simplify as much as possible :
=
=
131072
Hope this helped and have a good day