Answer:
t = 3.016
P-value = 0.0061
Step-by-step explanation:
Let us assume that the population variance is unequal
Null hypothesis :
μ = μ
μ ≠ μ
The alternative hypothesis :
Here we have
Since it is not given that variances are equal, degrees of freedom of the test is given as
The P-value of the test is = 0.0061
Since the p-value is less than 0.05, we will reject the null hypothesis
10x + 3y = 19
y = 2x + 5
Putting y in the first equation
10x + 3.(2x + 5) = 19
10x + 6x + 15 = 19
16x = 19 - 15
16x = 4
x = 4/16
x = 1/4
Now x in y
y = 2x + 5
y = 2.1/4 + 5
y = 2/4 + 5
y = 1/2 + 5
y = 11/2
Answer:
The age of E is 40
Step-by-step explanation:
When E didn't join them, the average age was 30,that is six years ago. But present making 36.
But when E joined, the average age is now 40.
2:6 so simplify it 1:3. This means the scale ratio is 1:3 for the figures. To find w, sub in the 3 from the smaller figure to the ratio so 3×3=9, 3:9 w=9