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SECTION B: STRUCTURED QUESTIONS Answer All Questions. B1. Try to flip a coin for 20 times and record as follows: The number of getting surface. Based on the records in the table, what is the probability that: I. Getting head surface II. Getting tail surface BZ A department store manager determines that a new billing system will be cost-effective only if the mean monthly account is more than RM 170. A random sample of 400 monthly accounts is drawn, for which the sample mean is RM 178. The accounts are approximately normally distributed with a standard deviation of RM 65. It is concluded that the new system will be cost-effective at a 5% significance level. I. State the null hypothesis and alternative hypothesis. Sketch the rejection region 0:: 0.05 SECTION C: PROBLEM SOLVING QUESTIONS Recently, our Minister of health was encouraging us to stay t and healthy during Covid 19 pandemic. Therefore, we need to conduct exercise in order to get fit and reduce the obesity problem. Thus, please estimate and record your exercise hours daily within a week as per the below table. Days Exercise hours Monday 2 Tuesday 2 Wednesday 2 Thursday 0 Fnday 1 Saturday 3 Sunday 3 I. Calculate the mean. II. Calculate the median. III. Calculate the mode. IV. Identify the range V. Calculate the variance. VI. Calculate the standard deviation. V11. Identify and draw the shape of the distribution