the initial statement is:

and then:

So the second statement is false because f should be multiply by e, not by d so is option C)
Answer:

Step-by-step explanation:
you have to use the midpoint formula which is

so you plug your numbers in

Add the tops

if possible simplify
and that is your answer
Answer:
1. P(A) = 0.6826
2. P(B) = 0.13591
Step-by-step explanation:
the first graph is given just as an example to show the percentage distribution values for bell shaped curve
Answer:
longest side=3.6
let ratio 3:5:6:9be 3x,5x,6xand9x
perimeter= sum of all side
9.2=3x+5x+6x+9x
9.2=23x
x=9.2÷23
x=0.4
9x=9×0.4=3.6
6x=6×0.4=2.4
5x=5×0.4=2
3x=3×0.4=1.2