Business Statistics

Chapter 7 | Continuous Probability Distributions 251

b) The probability that a worker’s weekly salary is less than Rs 1100 is

P(x < 1100) = 0.369441

c) The probability that a worker’s weekly salary is between Rs 1000 to Rs 1500 is

P(1000 < x < 1500) = 0.710743 – 0.289257 = 0.421485

d) The probability that a worker’s weekly salary is between Rs 1400 to Rs 1500 is

P(1400 < x < 1500) = 0.710743 – 0.630559 = 0.080184

e) The probability that a worker’s weekly salary is between Rs 1000 to Rs 1200 is

P(1000 < x < 1200) = 0.455764 – 0.289257 = 0.166507

Figure 7.46 is the Minitab output showing cumulative normal probabilities for

Example 7.9.

FIGURE ...