An economist claims that the population standard deviation of the monthly income of all the families that belong to the poverty level is Php 2, 500.00. A group of researchers surveyed 250 families that belong to the poverty level and obtained a mean monthly income of Php 3, 500.00. Assume that the monthly income of the families is approximately normally distributed. Find the 90% confidence interval of the monthly income of all the families that belong to the poverty level. O a. 3483.553,519.6 O c. 3483.55<µ<3,516 O d. 3483.55>p>3,516.45

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