Answer:
D. n>-7
Step-by-step explanation:
Answer:
Step-by-step explanation:
Let's solve:
Step 1: Simplify both sides of the equation.
Step 2: Add 3x to both sides.
Step 3: Subtract 4 from both sides.
Step 4: Divide both sides by -1.
Therefore, the answer will be x = 4.
Answer:
The 90% confidence interval for the population mean iron concentration is between 0.167 cc/m³ and 0.195 cc/m³.
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 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 0.181 - 0.0140 = 0.167 cc/m³.
The upper end of the interval is the sample mean added to M. So it is 0.181 + 0.0140 = 0.195 cc/m³.
The 90% confidence interval for the population mean iron concentration is between 0.167 cc/m³ and 0.195 cc/m³.
The volume is 13*7*5. Therefore, the answer is 455 in^3
A watch decreased in price by
4
5
. After the reduction it was priced at £10. What was the original price of the watch?