please help me understand this

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please help me understand this mathematics problem I'm stuckThe tuition X paid per semester by students in a university has a distribution with mean μ = $4500 and standard deviation σ = $900. If 550 students are interviewed, what is the approximate probability that the sample mean tuition X paid will be above $4450?i keep getting 4.39 but it doesn't seem to be the answer i need, I'm using a ti -84 

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(Top Tutor) Daniel C.
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