I take this course online so ive been struggling on this problem for a minute.. can anyone help? thanks!

The following represent statistics of weekly salaries at the Harper Publishing Company.
Mean = $470 Median = $475 Mode = $460 Standard deviation = $30 First Quartile = $450
Third Quartile = $485 79th Percentile = $545 P67 = $483
a) What is the most common salary?
b) What salary did half the employees surpass?
c) About what percent of employee’s salaries is below $485?
d) What percent of the employees are above $450?
e) What salary is 3 standard deviations below the mean?
f) About what percent of employee’s salaries is above $483?
g) What salary is 2 standard deviations above the mean?
h) Assume the weekly salaries are normally distributed, about what percent of the salaries are between $410 and $530?

step-by-step explanation:

we have

using a graphing tool

see the attached figure

this is a quadratic equation (vertical parabola) open up

the vertex is a > vertex

the domain of the function is all real > interval (-∞,∞)

the range of the function is the > [-6.125,∞)

the function has two x->   and

the function is increasing over the > (0.25,∞)

the function is decreasing over the > (-∞,0.25)

option (a)

step-by-step explanation:

step 1:   take 2 number whose product equal to 25..

and sum of those two number are -10

step: 2 for example here if we take 5,5 are the number,,

5*5=25

and

5+5=10

but we need -10

so if we take   -5,-5

so -5*-5=25

and -5+(-5)=-10

s0

come the equation

replace -10x by these number

like -5x -5x+25

take common

x(x-5)-5(x-5)=0

(x-5)(x-5)=0

a. george's love for snowboarding, bungee, jumping, and whitewater kayaking has lead to a scholarship.

the answer is  

c.

14,469 cubic feet

i know this one is right