Nick - if you have everything working up to part d, then why have you commented out part b?
As for part d, look closely at what your assignment requires:
Set up a for loop that: repeats 10000 times, and computes random values for resistor 1 and resistor 2 using the randn function as follows:
resistor_value = nominal_value + range/2*randn(1);
where resistor_value is the randomly computed value for the resistor, nominal_value is the expected value for the resistor, and range is the product of the tolerance for the resistor and the nominal resistor value. Stores the voltages on resistors 1 and 2 in vectors counts the number of circuits that do not meet the voltage tolerances.
So you need two arrays of size 10000x1 for each resistor. You will create a for loop that, on each iteration of the loop, will generate two values according to the above equation for each resistor. You will take these two values and determine a voltage for each resistor which you will store in the two arrays.
Presumably you are doing the above for each of the two trials described in step c, so you will have the appropriate nominal/expected value and tolerance that will be used in the above equation. The voltage source, along with the two resistor values, will be used to determine the voltage for each resistor.
Then use hist or histogram to create the histogram given the voltages for each resistor.
