(8)2-(3x)2 is the correct formula
Answer:
Step-by-step explanation:
Since; the density function diagrams were not included in the question; we will be unable to determine the best which depicts this problem.
However;
Let use X to represent the time required for the delivery.
Then X~N(3.8 ,0.8)
i.e
E(x) = 3.8
s.d(x) = 0.8
NOW; P(x>4) = P(X-3.8/0.8 > 4-3.8/0.8)
= P(Z > 0.25)
= 1-P(Z < 0.25)
=1 - Φ (0.25)
= 1 - 0.5987 ( from Normal table Φ (0.25) = 0.5987 )
= 0.4013
Thus; the probability a single delivery would take more than 4 hours is 0.4013
What is the z value corresponding to the interval boundary?
The z value is calculated as:


z = 0.25
There is 2 answers + and -. The i represents a imaginary number... the answer is 6+2i, 6-2i.
If 1,000 = 1 x 10(3) [one times ten to the 3rd power]
and 1,000,000 = 1 x 10(6) [one times ten to the 6th power]
There would be 100,000,000 (one hundred million pennies in a million dollars) [ $1million x 100 pennies/dollar]
Then counting your zeroes would add up to 8... so...
your answer would be...
1 x 10(8) [one times ten to the 8th power]
OR
1000 000 dollars x (100 pennies / 1dollar) = 100 000 000
its 1x10E8 pennies
12/-10 is the slope or 6/-5 simplified