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Class interval for wage classes

A survey was completed and the following two wage classes were used: ($4 - $7) and ($7 - $10). What is the class interval for these wage classes?

a. 2

b. 5

c. 4

d. 3

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## Q : Formula for binomial distribution

A safety engineer claims that 3 in 12 automobile accidents are due to driver fatigue. Using the formula for Binomial Distribution find the probability that at least 2 of 5 automobile accidents are due to driver fatigue.