So I think you should set up an equation like this: 14.95x+16.88y=131.18 , x+y=8

so x=8-y, plug this into the original equation:
14.95(8-y)+16.88y=131.18
Evaluate: 119.60-14.95y+16.88y=131.18
Combine like terms: 119.60+1.93y=131.18
Subtract 119.60 from both sides. You get: 1.93y=11.58
Divide both sides by 1.93. You get y=6

Plug into second equation: x+y=8 ---> x+6=8 and solve for x. x=2

Christine bought 2 video games and 6 CDs. 14.95(2)+16.88(6)=131.18

4 0

4 years ago

The probability that an individual is left-handed is 0.16. In a class of 40 students, what is the mean (or expected value) and s

shtirl [24]

Answer:

C. mean: 6.4 and standard deviation: 2.31862028

Step-by-step explanation:

We are given

n=40

p=0.16

q= 1-p = 0.84

mean = np = 40*0.16 = 6.4

standard deviation = $\sqrt{ np(1-p) }$

= $\sqrt{40*.016*(1- 0.16)}$

sd = 2.31862028

5 0

3 years ago