3. Professor Pete's calculus class has the following scores: 19 21 31 32 37 45 52 55 62 63 63 65 65 77 78 As you can see, more than half of the class would fail the class if a standard grade scale were used. That is why he is going to pass anyone who scores higher than 1 standard deviation below the mean. a. Use Excel to nd the standard deviation and mean and write them here. b. Find the new passing grade for the class