"X\\sim N(\\mu, \\sigma^2)"
Then
Given that "\\mu=2.4\\ kg, \\sigma=0.5\\ kg"
"P(X>x)=0.60"
"P(Z\\leq {x-2.4 \\over 0.5})=1-0.60=0.40"
"{x-2.4 \\over 0.5}\\approx-0.253348"
"x\\approx0.5(-0.253348)+2.4\\approx2.2733"
"\\text{Birth weight}=2.2733\\ kg"
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