Question

# B. Determine whether or not the table is a valid probability distribution of a discrete random...

B. Determine whether or not the table is a valid probability distribution of a discrete random variable. Explain fully.

 X 0.23 0.14 0.17 P(X=x) -0.22 0.38 0.84
1. Daily sales of a medium sized restaurant are normally distributed with a mean of \$720 and a standard deviation of \$80.
2. What is the probability that a randomly selected day will make a sales of at least \$656?
3. What is the probability that a randomly selected day will make a sales between \$680 and \$840?
4. What is the lowest amount of sales to put a day above the top 10% of daily sales?
 Donor ID Number of days before the next donation 1 33 2 37 3 34 4 36 5 33 6 32 7 34 8 33 9 32 10 35 11 32 12 36 13 32 14 34 15 35 16 35 17 35 18 33 19 32 20 33 21 35 22 31 23 35 24 34 25 35 26 36 27 37 28 36 29 33 30 33 31 34 32 35 33 31 34 34 35 34 36 36 37 33 38 33 39 34 40 37 41 32 42 31 43 35 44 31 45 37 46 36 47 37 48 31 49 31 50 36 51 35 52 36 53 32 54 33 55 33 56 33 57 33 58 35 59 35 60 36 61 32 62 34 63 36