(a) Based on a recent study, the monthly utility bills for three-room flats in Singapore can be assumed to be normally distributed with mean $135 and standard deviation $42. If a household living in a three-room flat is randomly selected, i. What is the probability that its utility bill is more than $155 ii. What is the probability that its utility bill is between $129 and $165? ii. If 20% of the utility bills for households living in three-room flats are above a certain value V, find the value of V.

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.