Use the NORMDIST spreadsheet function to answer these questions about the brakes described in Exercise 4-C: (a)

Question:

Use the NORMDIST spreadsheet function to answer these questions about the brakes described in Exercise 4-C:

(a) What fraction of brakes is expected to be 80% worn in less than 45 800 miles?

(b) What fraction is expected to be 80% worn at a mileage between 60 000 and 70 000 miles?


Table 4-1

Area |2| 1.4 y y Area z| y Area 0.0 0.398 9 0.000 0 0.149 7 0.419 2 2.8 0.007 9 0.497 4 0.1 0.397 0 0.039 8 1.5 0.129 5 0.433 2 2.9 0.006 0 0.498 1 0.2 0.391 0 0.079 3 1.6 0.110 9 0.445 2 3.0 0.004


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