Answer:
4 7/20
Step-by-step explanation:
8 1/4 - 3 9/10
get a common denominator of 20
8 1/4 *5/5 - 3 9/10 *2/2
8 5/20 - 3 18/20
borrow 1 from the 8 in the form of 20/20
7 +20/20 + 5/20 - 3 18/20
7 25/20 - 3 18/20
4 7/20
Total customers= 71+139+9 = 219
Probability that the next person will purchase no costume = 71/219=0.3242009132
C.
Because the marble is not replaced and that affects the next event where another marble is chosen.
8 2/3 or 26/3 is the answer
I changed them both to improper fractions, multiplied 10/3 times 8/5. Which equals 16/3. So i added 10/3 + 16/3 and got 26/3. If you change it into a mixed number you get 8 2/3