Answer: A. 1.2
Step-by-step explanation:
Given : Sample size : n= 64
Standard deviation: 
The formula to find the standard error of mean is given by :-

Therefore, the standard error of the mean= 1.2
Hence, A is the right option.
89.01 is the less equality of the center value of the question
Answer:
these are true = 1, 3, 5
Step-by-step explanation:
overall class a scored better than class b
they're more students in class a compared to class b
28: 1, 2, 4, 7, 14, 28
40: 1, 2, 4, 5, 8, 10, 20, 40
The common factors are 1, 2, and 4.
You can use a factor rainbow to help you find the factors (:
Answer:
20
Step-by-step explanation: