Question 928624
mean of 70 and a standard deviation of 15.  {{{z =blue (x - 70)/blue(15/sqrt(17)) =(x - 70)/3.638}}}
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 Using a TI calculator 0r similarly a Casio fx-115 ES plus
P(x > 75) = P( z > 5/3.638) = normalcdf(1.3744, 100)= .0847 0r 8.47%
P(x < 50) = P(z < -20/3.638) = normalcdf(-100, -5.498)= .0000000192
P( 60< x < 70) = P(-10/3.638 < z < 10/3.638) = normalcdf(-2.7488, 2.7488)= .9940