Answer:
Mean 24, standard error 0.8
Step-by-step explanation:
The Central Limit Theorem estabilishes that, for a random variable X, with mean
and standard deviation
, the sample means with size n of at least 30 can be approximated to a normal distribution with mean
and standard deviation, also called standard error 
In this problem, we have that:

What are the mean and the standard error of the sample mean?
By the Central Limit Theorem, mean 24 and standard error 

There are two changes of sign, so there are 2 or 0 possible positive roots.

There are two changes of sign, so there are 2 or 0 possible negative roots.
There are 4,2 or 0 possible non-real roots.
Answer:
B
Step-by-step explanation:
Because <u>at least </u>means not less than 50 or equal to 50
Since he wrote 18 pages then you have to add.
Answer:
24
Step-by-step explanation:
60/5 (7-5)
= 12(2)
= 24
Answer:
105
Step-by-step explanation:
Substitute X for 7: 3(7)(7-2)
Simplify: 21(5)
Multiply: 105