Mean : m = 2.2
Standard deviation: s = 0.3
m - 1 s = 2.2 - 0.3 = 1.9
m + 1 s = 2.2 + 0.3 = 2.5
For the normal distribution the values less than 1 standard deviation away from the mean account for 68.27 % of the set.
Answer: D ) 68 %
It would be a right angle
BUC ={0,3,4,5,67,89}
I hope it will be answer of your question
The answer is 6.5t2+0.5t−5.5 , it’s simplified