parents work outside the home spends 20 hours a week watching television. The
population mean = 20 and the standard deviation of the distribution is equal to 5.
Calculate the z-scores for the following individual times:________
If X = 5, z= ________
If X = 37, z= ________
Answer: If X = 5, z=-3
If X = 37, z= 3.4
Step-by-step explanation:
We know that the formula to find the z-score for any random variable x is given by :-
, where = Population mean
= Population standard deviation.
As per given , we have
Then , the z-score for x =5
i.e. If X = 5, z=-3
When x =37,then
i.e. If X = 37, z= 3.4
Answer:
Number of hours Jenny swims each morning = 3 hours
Step-by-step explanation:
Let Jenny swims 'x' hours in the morning each day.
She swims 2 hours in the evening too.
Total hours she swims each day = (x + 2) hours
If her team swims 4 hours per week then number of hours she swims = 4(x + 2)
If she swims 20 hours in a week then,
4(x + 2) = 20
(x + 2) = 5
x = 5 - 2
x = 3 hours
Therefore, Jenny swims 3 hours each morning.
Y = -5x – 1
A) One
B) None
C) Infinite
D) Two