The average score on a standardized test is 750 points with a standard deviation of 50 points. What is the probability that a student scored more than 850 on the standardized test ?
The probability that student scored more than 850 we shall proceed as follows: z=(x-μ)/σ where: x=850 μ=750 σ=50 thus z=(850-750)/50 z=2 thus P(x>850)=1-P(x<850)=1-P(z<2)=1-0.9772=0.0228
