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A nuclear reactor facility has two separate safety systems in place to prevent a nuclear meltdown. They prevent meltdown by shutting down the reactor when the temperature reaches the danger level. The first system shuts down the reactor 80% of the time when the danger level is reached. The second system (which is completely separate from the first) shuts down the reactor 90% of the time when the danger level is reached.
a. Use your calculator to do 10 repetitions with the first system alone. Theoretically it should successfully shut it down 16 out of 20 times.
b. Use your calculator to do 10 repetitions with the second system alone. Theoretically it should successfully shut it down 18 out of 20 times.
c. Use your calculator to do 20 repetitions with the first and second systems working together. The reactor will successfully shut down if one or both systems are not working.

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MissPhiladelphia
a) randInt(1,100) then hit the ENTER button. Then, just record the answer on a sheet of paper. 

Next, hit "ENTER" again and you will get the next number. Continue hitting ENTER until you record all 10 values. 

For example, when I do it, I get ... 

30 
61 
38 
42 
58 
89 
39 
57 
65 
61 

Now any number between 1 and 80 is a shutdown. For my example, they were ALL shutdowns 
b) randInt(1,100) ... the only difference here is use 1 to 90 for shutdown 

c) Here you want to do the same thing except create 2 columns. Put 20 random numbers in EACH column using the exact same function randInt(1,100) 

Now if either the first column is 1-80 or the second column is 1-90, then put the word shutdown next to that line. 

For example, 

85 75 shutdown because the second column is between 1-90 

85 93 no shutdown because both are outside the range. 

Hope that helps 

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