Proportion of Observations Within an Interval
What is the proportion...?
What is the proportion...?
1) state the problem in terms of x
2) show the work for z (standardize z)
3) write the probability in terms of z
4) draw a normal curve and shade the area of interest
5) use normalcdf to obtain the proportion
6) state conclusion in context
Ex.
The distance Tiger Woods can hit a golf ball follows a normal distribution N(304, 8). What proportion of drives goes at least 290 yards?
P(x > 290)
P(z > (290-304)/8)
P(z > -1.75)
6. The proportion of drives hit by Tiger Woods that are at least 290 yards is 0.9599.
4.
5.