Recall that for a binomial distribution, = np gives the expected number of successes for the random variable r. Recall that n = 7 and p = 0.01. Substitute the values for n and p into the formula and simplify. = np = (0.01) = syringes If is the expected number of successes and a success is finding a defective syringe, then the expected number of syringes the inspector will find in this sample is