The cost of a meal for a sample of eight customers was recorded. The results (in Rands) were as follows: 130.11 129.85 130.05 128.53 129.99 129.85 130.18 129.98 a) Estimate a 90% confidence interval for the true average of cost of a meal.  b) Calculate the length of the confidence interval. c) Provide the correct interpretation of the confidence interval you have calculated in a).

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