I'm sorry but I do not know how to do this
Answer:
The answer is 15.95 to 16.15 ounces
Make your graph then were for the variable y find the coordinate 1,5 and then go over 4 .
To calculate P(at least one valve opens), we can find 1 - p(no valves open).
This is equal to 1 - (0.05)^5, or 0.9999996875.
P(at least one valve fails to open) is equal to 1 - p(all valves open and none fail). This is 1 - (0.95)^5, or 0.2262190625.