# The following data give the prices of seven textbooks randomly selected from a university bookstore. \$93 \$173 \$107 \$125 \$56 \$163 \$144 a. Find the mean for these data. Calculate the deviations of the data values from the mean. Is the sum of these deviations zero? Mean = \$ 123 Deviation from the mean for \$173 = \$ 0 Sum of these deviations = \$ -433 b. Calculate the range, variance, and standard deviation. [Round your answers to 2 decimal places.] Range = \$ Variance = Standard deviation = \$ Click if you would like to Show Work for this question: Open Show Work LINK TO TEXT

Mean = \$123

Standard deviation = 10190

Variance = 1698

Step-by-step explanation:

Mean=?

= sum of all numbers/ Total numbers

a  =  93+173+107+125+56+163+144 / 7  = 861/7 = \$123

Standard deviation=?

we know that = Sqareroot [ Sum (y)²] / N

we need deviation:

=    x-a         =  y   ;    y²

= 93-123 = -30  ;   900

=173-123 = 50  ;    2500

=107-123  =  -16 ;   256

=125-123  = 2   ;    4

=56-123   =  -67 ;   4489

=163-123  =  40  ;   1600

=144-123   =  21   ;   441

Sum of y²            =   10190.

= Square root [  10190 / 7 ]

=  38.1

Variance = ?

= Sum ( y)² / N-1

=  10190 / ( 7-1)

= 10190 /6

= 1698

## Related Questions

A lamina occupies the disk x squared space plus space y squared space less or equal than 4. Find the mass, if the density at any point is proportional to its distance from the origin, where the proportionality constant is 3.

Answer: Mass of Lamina is (K/3)

Centre of mass is (3/8, 3pi/16)

Step-by-step explanation:

Find explanation in the attachments

In second grade Eliza was given 500 from her grandparents this money was deposited into a savings account that earns 3% annual interest compounded quarterly find the account balance at graduation is there no other deposits or withdrawals in the account

account balance at graduation is 674.17

Step-by-step explanation:

given data

deposit money P  =  500

interest rate = 3 % compounded quarterly

we take time period = 10 year ( 2nd grade to 12 grade)

solution

we apply here compound interest formula that is

amount =      ..................1

put here value and we get

amount =

amount = 674.174

so account balance at graduation is 674.17

\$694.63

Step-by-step explanation:

The formula is p(1+r/n)^tn. P, or the principal amount, is 500 dollars. R, or the rate as a decimal, is 0.03. N, or the number of times compounded yearly, is 4. T, or the time in years, is 11, since there are 11 years from grade 2 to grade 12. 12-2+1=11. Now, plug in the information given. 500(1+0.03/4)^4*11 = 500(1.0075)^44 = 694.63 dollars, rounded to the nearest cent.

.I’ll give you a brainliest to whoever does itSimplify by combine like terms
3X+4Y+5X-2y+10-8

Step-by-step explanation:

8x+2y-2

Solve the inequality for x. –8x + 16 > –72

x>11

Step-by-step explanation:

x needs to be alone so subtract 16 on both sides, making the equation -8x > -88, next simply make x positive amd alone by dividing -8 on both sides, ending in the result of × > 11

Two parallel lines are crossed by a transversal.What is the value of x?

Could someone tell me how to solve this?

because both lines are parallel, if you add the 5x+5 to the 115 those would equal 180 degrees

so you have 5x+5 + 115 = 180

combine like terms:

5x + 120 = 180

subtract 120 from both sides

5x = 60

x = 60/5
x = 12
Okay so (5x+5)+115 is going to equal 180.

1.) (5x+5)+115=180

The next steps is to isolate the x.

2.) 5x+120=180
3.)  -120=-120
4.) 5x=60
5.) /5=/5
6.) x=12 degrees

Then, you check your work by plugging in the numbers.
7.) 5(12)+5+115=180
8.) 60+5+115=180
9.)180=180

Let f(x)=3x+5, g(x)=2^x
Find f(g(x))