Answer:
D
Step-by-step explanation:
I am a wiz
Overdrafting is when you deposit you're money in a bank account so it could either be +75 or -75 both of them might be correct.
Answer:
Step-by-step explanation:
We want to determine a 90% confidence interval for the mean amount of time that teens spend online each week.
Number of sample, n = 41
Mean, u = 43.1 hours
Standard deviation, s = 5.91 hours
For a confidence level of 90%, the corresponding z value is 1.645. This is determined from the normal distribution table.
We will apply the formula
Confidence interval
= mean +/- z ×standard deviation/√n
It becomes
43.1 ± 1.645 × 5.91/√41
= 43.1 ± 1.645 × 0.923
= 43.1 ± 1.52
The lower end of the confidence interval is 43.1 - 1.52 =41.58
The upper end of the confidence interval is 43.1 + 1.52 =44.62
Therefore, with 90% confidence interval, the mean amount of time that teens spend online each week is between 41.58 and 44.62
3 x 2 + 2x -5 = x or 1x. or 3x 2 + 2x - 5 = 5x + 3.
-4 + 7x 2 = -2 + 7x
Answer:
30
Step-by-step explanation: