Step-by-step explanation:
with the y= 4x +1
they find the first column by replacing x in the function by 0
meaning if x= 0 then y=4(0) + 1 so y=1
for the second column if x =2 then y= 4(2) +1 so y= 9
for the 3rd one if x =4 then y = 4(4)+1 so y = 17
Answer:
2(y-10) less/= -28
Step-by-step explanation:
2(y-10) less/= -28
Answer:
The 90% confidence interval for the mean usage of electricity is between 17.4 kwH and 17.6 kwH
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 1-0.05 = 0.95, so z = 1.645
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.
So

The lower end of the interval is the mean subtracted by M. So 17.5 - 0.14 = 17.4 kwH
The upper end of the interval is M added to the mean. So 17.5 + 0.14 = 17.6 kwH
The 90% confidence interval for the mean usage of electricity is between 17.4 kwH and 17.6 kwH
Answer:
Step-by-step explanation:
if its earned u add, if its spent, u subtract
57 - 34 + 58 + 72.....initial expression
153....simplified expression