They are already in order 6 × 2/5, 3 2/3 × 2/5, 2/7 × 2/5, 2/2 × 2/5
Answer:
B
Step-by-step explanation:
-8/2=-4=x
8/2=4=y
Answer:
80
Explanation:
The mean of the distribution of sample means always target the population mean. What this line tells is that whatever the population mean will be, the mean of the distribution of sample means will be same. Since the population mean is 80, the mean of distribution of sample means will also be 80.
However, the standard deviation of the sample distributions is different and is equal to the population standard deviation divided by square root of sample size. So in this case the standard deviation of distribution of sample means will be 6 .
Answer:
t = 26
Step-by-step explanation:
Step 1: Subtract 9 from both sides.
Step 2: Check if solution is correct.
Therefore, t = 26.
Speed = dis / time
let plane speed in still air is X and air speed Y
so, X-Y = 2280/4 = 570 km/h
and X+Y = 6650/7 = 950 km/h
so, X = (570 + 950) / 2 = 760 km/h
and Y = 950- 760 = 190 km/h
:)
