Examine the following table. x
1
2
3
4
5
P(x)
0.2
0.3
0.4
0.1
0.05

Does this table represent a probability distribution? Explain your answer.
a.
Yes, because the sum of the probabilites is less than one.
b.
Yes, because the sum of the probabilities is more than one.
c.
No, because the sum of the probabilities is more than one.
d.
No, because the sum of the probabilities is less than one.

The students at jefferson middle school are raising money for a charity by selling t-shirts and hats. the number of t-shirts sold was 3 times the number of hats. the profit was $5 for each t-shirt sold and $2.50 for each hat sold. the students raised $840 for the charity. they used the system below to analyze their success and found the solution to be (144, 48). 5x+2.50y=840 x=3y how much did they earn from t-shirt sales?