Answer:
Taking data:
28 78 74 89 72
50 55 66 26 84
59 64 88 23 27
70 63 42 37 29
The answer is 
Step-by-step explanation:
As the data is not given in the question i'm guessing the data from the question i solved before
28 78 74 89 72
50 55 66 26 84
59 64 88 23 27
70 63 42 37 29
as taking the above data,



As we know for finding the width of class:


≈ 
Note : By using the above given formula you can calculate the width of any data just by taking the maximum and minimum values of data and the number of classes the data is divided into.
Answer: Not unusual.
Step-by-step explanation:
We know that the z-scores lower than -1.96 or higher than 1.96 are considered as unusual.
Given : Sample size : n= 65
Sample mean = 
Standard deviation : 
Formula for z-score : 
At x= 213

Since , -1.96< 0.17 <1.96
It means the probability of a sample mean being greater than 213 is not unusual.
C. 3 times 1/3 = 1 Its inverse property so that’s why it the answer
Answer:
Step-by-step explanation:
Th correct one is the third box
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