Answer:
B
Step-by-step explanation:
Answer: 45
Step-by-step explanation:
The rectangle is: 7 * 5
The triangle is: (4 * 5)/2
7 * 5 = 35
4 * 5 = 20
20/2 = 10
10 + 35 = 45
For normal distribution 95% lie in the range mean-2*standard deviation for lower bound and mean+2*standard deviation for upper bound.
Upper bound is 78+2*6=78+12=90
Lower bound is 78-2*6=78-12=66
B. 66 and 90
