Not sure how to answer math problem below

A men's clothing store developed a customer waist size probability table from a sample of 300 customers, as shown. Waist Size (Inches) Probability 26-28 0.000 28-30 0.025 30-32 0.175 32-34 0.295 34-36 0.300 36-38 0.160 38-40 0.045 40-42 0.000 a) Find the number of customers in this sample who had waist sizes from 30-36 inches. [1C] b) Is this distribution a uniform distribution? Explain. [1C]