Sue took a test in both biology and math last week. The biology test had a mean of 70 and a standard deviation of 7, whereas the math test had a mean of 75 and a standard deviation of 10. Sue scored a 76 on the biology test and a 76 on the math test. On which test did she do better in comparison to the rest of the class?Choose onethe math testthe biology testShe did the same on each test.cannot be determined

Jack and Jill go to different schools. Jack got an 77 on a test with a mean of 60 and a standard deviation of 15. Jill got a 76 on a test with a mean of 60 and a standard deviation of 8. If both tests are graded on a curve, who did better?

(b) The percentage results in a Maths exam for a class had a mean mark of 70 with a standard deviation of 15. The percentage results in an English exam for the same class had a mean mark of 72 with a standard deviation of 10. The results in both exams were normally distributed. (i) Mary got 65 in Maths and 68 in English. In which exam did Mary do better relative to the other students in the class? Justify your answer. ݖଵ Answer: Justification: 0

Heidi and John are teachers teaching similar classes and both gave their classes an exam.  Here are the summaries for the exam scores:Heidi's class:Mean 75Median 78Standard Deviation 3John's class:Mean 75Median 65Standard Deviation 12 Which of the following statements is most correct?  Group of answer choicesJohn's class had some students who received very low scores, exactly 50% of his students scored less than or equal to 75%, and the scores were quite varied when compared to Heidi's class scores.John's class likely had some outlier scores that were very high, exactly 50% of his students scored less than or equal to 65%, and the scores were quite varied when compared to Heidi's class scores.The scores in John's class were more consistent than the scores in Heidi's class.Since the median is higher than the mean in Heidi's class, there were likely some outlier scores that were very high.John's class likely had some outlier scores that were very high and thus the mean would be the best measure of center for his data set.

After six biology tests, Ruben has a mean score of 75. What score does Ruben need on the next test to raise his average (mean) to 77?

Ms. Curie is a 11th grade science teacher.  After grading the first two exams, she computed the mean and standard deviation for each exam.    Mean Exam Score  Standard Deviation of Exam ScoresExam 1 90 8.5Exam 2 81 3.2 Which of the following best describes what the standard deviations tell Ms. Curie about the exams. Group of answer choicesThe scores on Exam 1 were better at measuring learning than the scores on Exam 2.The scores on Exam 1 were lower than the scores on Exam 2.The scores on Exam 1 were more consistent than the scores on Exam 2.The scores on Exam 1 were higher than the scores on Exam 2.The scores on Exam 1 were more spread out than the scores on Exam 2.