Answer:
choose 2 friends from 22 friends, we have 231 options
Answer: 0.73^9
Step-by-step explanation: Khan
answer
45
step-by-step explanation
total = day1 + day2 + remaining
total = 70
day1 = 10
day2 = 15
plug in values
70 = 10 + 15 + remaining
remaining = 70 - 10 - 15
remaining = 45 cans
We are looking for the probability :

Transform the law to standard normal like this:

The above formula is equivalent to this one:

From normal law table, we read the value of

.

Solving the above equation for the score n:


, it is the score we are looking for.