Statistics CP Homework Pg: 73 - 75 #42 - 46 EVEN & #50 & 52
Mean of Frequency Distributions
Name:
Date:
Period:
Finding the Weighted Mean In Exercises 42 – 46 Even, find the weighted mean of the data.
#42) Salaries The average starting salaries (by degree attained) for 25 employees at a company are given.
What is the mean starting salary for these employees?
8 with MBAs: $92,500
17 with Bas in business: $68,000

1. 22

2. 1

3. 7

4. 18

step-by-step explanation

e2020 got it right

the largest number of the four options is 1.8 x 10-2

you have it in scientific notation.

1.80 x 10-6   = 0.00000180

1.80 x 10-4   = 0.000180 (bigger, or "less small", than the former one)

so

1.8 x 10-2       = 0.0180. as you see. the "less small", or the biggest one of them all.

as you have negative exponent, it means you are dividing 1.8 by 100 (i.e. moving the dot towards left, two times).

if you had positive exponent for the scientific notation, power of tenths, you would be multiplying times 100 (moving the dot towards right) as below:

1.8 x (10)2 = 180

so. if you have negative exponent in scientific notation, move the dot toward left. if it is positive, toward right as many times the exponent tells you.

second option

step-by-step explanation:

the measures of a triangle equal 180. use that to find x.

2x+3x+4x=180

9x=180

9x/9=180/9

x=20

now you know x, you know angle a is 40°, angle b is 60°, angle c is 80°.

because angle a is 40°, the first option doesn't work.

because angle b is 60°, the second option does work.

when you add angle a and b, you get 100°. complementary means it equals 90°, so the third option doesn't work.

when you add angle a and c, you get 120°, which is not 100.

the answer is:

mean: 6

mad: 2.14