3. Mr. Gonzalez gave a test to 43 students in his calculus class. He graded the test 67 with a standard deviation of 8.4. After returning the exams, he realized that I problem 11, so he gave all students 5 extra points on their test score. [6 pts.] (a) What is the new mean score for this test? (b) What is the new standard deviation for his test? 4. The distribution of IQ scores of 12-year-olds is normal with a mean of 1 The distribution of IQ scores for 20-year-olds is also unimodal and syn standard deviation of 20. olds. Be sure to