Answer:
x=-1
Step-by-step explanation:
-8x+32=40
-8x=8
x=-1
Answer:
Step-by-step explanation:
We have to select george but not nina with two other people
No. of ways selecting 2 two people knowing Geroge will be the third one is
(beacuse we have to exclude Nina)
And total no of ways of selecting 3 people out of 8 people is 
Therefore the required Probability is 
=
Answer:
BC = 50
Step-by-step explanation:
BC = AD in a parallelogram
4x-10 = 3x+5
Subtract 3x from each side
4x-3x-10 = 3x-3x+5
x-10 = 5
Add 10 to each side
x-10+10 = 5+10
x = 15
BC = 4x-10 = 4*15-10 = 60-10 = 50
The anwer plus working is 6668/4=151.55
What we can say with a good deal of certainty is that our sample is biased towards the higher spectrum and that the real value of the mean for our population is lower than the obtained value of our sample. If this is true, we should expect for the standard deviation to be higher than in the population.
