Answer:
For 99% of confidence interval is 67.5±1.3524
Step-by-step explanation:
Given:
Mean height =67.5 inches
Standard deviation:2.1 inches
Z at 99%.
No of samples 16.
To find:
confidence interval
Solution:
We have formula for confidence interval,
=mean ±Z*{standard deviation/sqrt(no.of observation)}
Now
Z=99%
has standard value as ,
Z=2.576
Confidence interval= mean±Z{standard deviation/sqrt(No. of samples)}
=67.5±2.57{(2.1/sqrt(16)}
=67.5±2.576(2.1/4)
=67.5±1.3524
Answer:
X is 8
Step-by-step explanation:


Answer:
4
Step-by-step explanation:
but im not sure
Sum = adding correct.
That means we need to add 7+5 =12
and add the /8 to it
12/8
But thats improper so we need to simplify.
1 4/8
But theres still some simplifying.
4/8=1/2
That means your answer is 1 1/2
Hope this helped :)