This site will tell you how https://sciencing.com/write-functions-math-8315770.html
I’m not very good at explaining it sorry
For number 2 it's would be 12.8
Sorry I don't have time for number 3
We can convert 7/10 to a decimal first.
7/10 = 0.7
Now we can multiply this problem easier.
35 x 0.7 = 24.5
Given:
mean = 64
standard deviation = 6
sample size = 50
Standard error of the sample mean = standard deviation / √sample size
Standard error = 6 / √50 = 6/7.07 =<span> 0.85</span>
