Answer: 95% confidence interval would be (26.01,29.39).
Step-by-step explanation:
Since we have given that
n = 50
Mean = 27.7
Standard deviation = 6.12
We need to construct 95% confidence interval for the population.
so, z = 1.96
So, it becomes,
Hence, 95% confidence interval would be (26.01,29.39).
Answer:
3
Step-by-step explanation:
Answer:
Answer: Option d. 4×
Step-by-step explanation:
In any sequence where ratio of the terms is given we always use the formula
A(n) = A(1)
Here A(n) is the term n
A(1) is the first term
n= number of trms
and r = ration of the terms
Here the given sequence is 40,0.4,0.004........
So A(1) = 40
Ratio 'r' of second and first term is =0.4/40=1/100
We have to find 7th term so n=7
Now we put the values in the formula
A(7) =
=
=
= 40×
= 4×
Answer:
Step-by-step explanation:
The first thing to identify is that this one is a consecutive set, meaning that the increment between each number is the same, in this case, an increment of 3 between each number, when sets have this type of behavior, and only on these cases, the mean and the median are the same, let's look at some examples:
[2, 4, 6, 8, 10, 12]
The mean would be:
mean==7
Since the number of elements is even, the median would be the average of the two middle terms:
median==7
As you can see mean=median
There is one more thing to help you in this exercise, for consecutive sets, the mean can also be calculated by the formula:
Where is the first term of the set and
is the last.
If we ran this formula with the set i used as an example:
mean=.
So applying all of that to the set given we would have: