The cost per item at a supermarket follows an exponential distribution. There are many inexpensive items and a few relatively expensive ones. The mean cost per item is $3.50. What is the percentage of items that cost: A. Less than $1? ROUND YOUR ANSWER TO 4 DECIMAL PLACES!!

B. More than $4? ROUND YOUR ANSWER TO 4 DECIMAL PLACES!!

C. Between $2 and $3? ROUND YOUR ANSWER TO 4 DECIMAL PLACES!!!

D. Find the 40th percentile. Sixty percent of the supermarket items cost more than what amount? ROUND YOUR ANSWER TO 2 DECIMAL PLACES!!

the answer would be 484

step-by-step explanation:

just multiply 0.484 times 1,000 (formula)

system of linear equation

step-by-step explanation:

as given in the data

a= 20 , b= -12

let us suppose that it is a straight line equation

now we know the formula for the system of linear equation

b= ma + c )

here m is slope of a straight line which is equal to formula

m=   (ii)

and here c is a constant

now putting the value of a and b in equation (ii)

m=

m=

putting the value of a,b and m in equation (i) gives us

-12 = + c

-12=-12 + c

adding 12 to both sides

-12 +12 = -12 +12 +c

0 =c

or c=0

as the value of the constant is zero which gives us that it is a linear equation and this order pair satisfies the system of linear equations.

um is there supposed to be a picture?

so mark-up is 0.4 multiplied by 180 = 72