Answer:
Step-by-step explanation:
This is a question on hypothesis testing.
Population mean based on 30 year average for July was 90 with
a std deviation of 2.1
Sample of 5 shows average 93.5
To check whether sample average = population average
H0: x bar =90
Ha: x bar not equal 90(Two tailed test)
Test statistic = 
=3.73
Since this lies outside the range (-1.96, 1.96) we reject null hypothesis
Hence we cannot say sample mean equals 90
Answer:
2 : 15 x 2 = 4 : 30
Step-by-step explanation:
You get the ratio 4:30 by multiplying both numbers of the original ratio by 2.
2x2= 4
2x15=30
So in conclusion, the answer to the problem is 4 : 30.
Answer:
Point form : (1,1)
Equation form : x=1 , y=1
Step-by-step explanation: Solve for the first variable in one of the equations, then substitute the result into the other equation.
Hope this helps you out! ☺
Answer:
240%
Step-by-step explanation:
100 x (425 - 125) / 125
