Help me answer this please

2:11 J (83) 163 . Q . 1 55% Quiz Finals.docx A, In an examination taken by 400 students, the scores were as shown in the following distribution table: Marks Frequency Find : 1 - 10 a. The mean 11 -20 14 b. The mode 21 -30 32 The median 31-40 56 d. Variance 41-50 102 e. Standard Deviation 51 -60 Interpret the results 61 -70 54 71 -80 30 81 - 90 16 91 -100 B B. One-sample t-test. To test the hypothesis that eating fish makes one smarter, a random sample of 12 persons take a fish oil supplement for one year and then are given an IQ test. Here are the results: 116 111 101 120 99 94 106 115 107 101 110 92 Test using the following hypotheses, report the test statistic with the P-value, then summarize your conclusion. HO: = 100. Ha: u > 100 C. The population of all verbal GRE scores are known to have a standard deviation of 8.5. The Psychology department hopes to receive applicants with a verbal GRE scores over 210. This year, the mean verbal GRE scores for the 42 applicants was 212.79. Using a value of a =0.05 is this new mean significantly greater than the desired mean of 210