It is called a negative number. For example, -4 -976 -23 -21
200,000,000,000 I believe that is 200 billion
400,000,000 That is 400 million
Answer: ($143.69, $156.31)
Step-by-step explanation:
Confidence interval to estimate population mean :

, where
= population standard deviation
n= sample size
Sample mean
z= critical value.
As per given,
n= 40
= $15.50
$150
Critical value for 99% confidence level = 2.576
Then, 99% confidence interval for the population mean:

Hence, the required confidence interval : ($143.69, $156.31)
Answer:
-2 and 12
Step-by-step explanation:
To find the two numbers which are 7 units away from 5, add 7 to 5 and subtract 7 from 5
5+7 = 12
5-7 = -2