Question 878491
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Hi
mean of $21,500.00 and a standard deviation of about $700.00
Since this is a continuous function, we have P(x < 20975) = P(x &#8804; 20975) etc
a) normalcdf(-9999, 23068, 21500,700) + (1 - normalcdf(-9999, 23145, 21500,700)
b) normalcdf(-9999, 23068, 21500,700) - (1 - normalcdf(-9999,20128, 21500,700)
Using z's
a) P(z &#8804; -525/700) + (1 - P(z &#8804; 1645/700)
b) P( z &#8804; 1568/700) - P(z &#8804; -1372/700