Question: You are told that a variable X follows a normal model with = 4.8 but the standard deviation is unknown. You are further told that

You are told that a variable X follows a normal model with = 4.8 but the standard deviation is unknown. You are further told that 1.5% of the values are above an x value of 7.2.

What is the value of ?

Please give your answer correctly rounded to two decimal places

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