Answer:
Yes, the mean number is more than 40
Step-by-step explanation:
The null hypothesis
H0 = mean is 40
Let´s make the t test
t = (x – mean) / standard deviation / √sample size
t = (42 – 40) / 2.1 / √28
t = 5.039
now we find t value for one tail, using a T-distribution table
df = n – 1 = 27
α = 0.05
so, t = 1.703
since our calculated t value is greater than the t for the table, the null hypothesis can be rejected. So the mean number of calls per salesperson per week is more than 40.
Answer: he can make 3 groups of 2 first group him and Alfalfa second group Bernie and Corey the third group Dominik and Elsa.
Step-by-step explanation:
I’m going to use the second one to explain
-8j + 14 = -2(4j-7)
So you distribute -2 into the parentheses on the right side, and you get -8j + 14, which is the same as the left side. Therefore, it is a true statement. It turns from a - to a + because it is two negative numbers multiplying by each other.
Density= mass/size
=1830/2 = 915 kg/m^3