Answer:
The probability that more than half of the sample would vote for him is P=0.7549.
Step-by-step explanation:
With a sample size of n=300, we can approximate this to the normal distribution.
The parameters will be

We have to calculate the probability that half or more of the sample vote for him. This is P(x>150).
To calculate this probability, first we calculate the z-value:

Then

The probability that more than half of the sample would vote for him is P=0.7549.
498-53=445
445/2=222.5
222.5+53=275.5
so there were 222.5 student tickets sold
to check: 275.5 + 222.5+498
Hundred is: 600
ten is: 620
Be sure to give me a thanks and rate me up :D
⭐x=7 because
10x+65=135
10x=70
x=7
28=4y-4
32=4y
⭐y=8
I hope this helps
Answer:
b. 98
Step-by-step explanation:
We have that to find our
level, that is the subtraction of 1 by the confidence interval divided by 2. So:

Now, we have to find z in the Ztable as such z has a pvalue of
.
So it is z with a pvalue of
, so 
Now, find M as such

In which
is the standard deviation of the population and n is the size of the sample.
In this problem, we have that:






So a sample of at least 98 is required.
The correct answer is:
b. 98