2. A TV commercial was shown 25 times. After which, it has been found out that the total sales of the product advcrtiscd had a mean of P150, 000 a week with a standard deviation of P95,000. a. What is the probability that the sample mean belongs to the interval of P 140,000 to P 160, 0008 b. What is the interval if the mean sale covers the middle 90% of the distribution of the sample mean.

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