Answer:
0.9007 is the probability that a student scored below 86 on this exam.
Step-by-step explanation:
We are given the following information in the question:
Mean, μ = 77
Standard Deviation, σ = 7
We are given that the distribution of examination grades is a bell shaped distribution that is a normal distribution.
Formula:

a) P(student scored below 86)
P(x < 86)
Calculation the value from standard normal z table, we have,

0.9007 is the probability that a student scored below 86 on this exam.
The numbers are 6 and -2.
6 + -2 is 4
as well as 6 x -2 is -12
The expression that could best describe the statement would be " 40 n + 20

260.
yo sup??
The number can't be a probability of an event cause probability of an even lied between 0 and 1 whereas the number given to use is -0.25.
Since probability can't be negative therefore it isn't a probability of an event.
Hope this helps.
Answer:
20736
Step-by-step explanation:
xy^4 = z
x=4 , y=3
(4*3)^4=z
12^4=z
z=20736