Answer:
Null hypothesis 
Alternative hypothesis 
The p value is 0.000517, which is less than the significance level 0.01, therefore we reject the null hypothesis and conclude that population mean is not equal to 5.00.
Step-by-step explanation:
It is given that a data set lists earthquake depths. The summary statistics are



Level of significance = 0.01
We need to test the claim of a seismologist that these earthquakes are from a population with a mean equal to 5.00.
Null hypothesis 
Alternative hypothesis 
The formula for z-value is




The p-value for z=3.4719 is 0.000517.
Since the p value is 0.000517, which is less than the significance level 0.01, therefore we reject the null hypothesis and conclude that population mean is not equal to 5.00.
I'm not 100% sure but try A.
Answer:
8.94
Step-by-step explanation:

Answer:
Joel need to practice this week =
hour
Step-by-step explanation:
P.S - the exact question is -
As given
Total practice goal of Joel =
hours
He practiced on : Monday -
hours
Wednesday -
hours
Thursday - 1 hour
Let the remaining practice = x hours
⇒ Total practice =
hours
⇒
+
+ 1 + x =
⇒ 1 + 
⇒3 + x - 4 = 
⇒x - 1 = 
⇒x =
⇒x =
hour
∴ we get
Joel need to practice this week =
hour