Answer:0.36
Step-by-step explanation:
You divide 18 by 6.50, that give you the cost per ounce
Answer:
11.5
Step-by-step explanation:
Simple interest formula:

where
I = interest
P = principal
r = rate
t = time
In your case,
P = $4,000
I = $4,920 - $4,000 = $920
t = 2 years
So,

The rate as decimal is 0.115 that is 11.5% as percent
We have the formula to compute the probability of having exactly k successed over n trials, given a probability p of success (and implicitly a probability 1-p of failure), which is

Now, the probability of at least 3 successes is the union of the following event: exactly three successes,exactly four successes and exactly five successes.
We can compute their probability and sum them:
So, the answer is about 36.79%
2. 9
3.500
I didn’t get the rest yet