# Question: When he types reports Tom makes typing errors at an

When he types reports, Tom makes typing errors at an average rate of .7 errors per page. Assume that all the Poisson conditions—independence, etc.—are met. Letting x represent values of the random variable “number of typing errors on a page,” use the Poisson table to

a. Determine the probability that x = 1 (that is, the probability that Tom makes exactly 1 typing error on a randomly selected page).

b. Compute the expected number of typing errors on a page, using the expression

E(x) = ∑[x • P(x)].

c. Compare your answer in part b to the value of λ.

d. Compute the variance for the distribution using the general expression

σ2 = ∑[(x ─ E(x))2 • P(x)].

e. Compare your answer in part d to the value of λ.

a. Determine the probability that x = 1 (that is, the probability that Tom makes exactly 1 typing error on a randomly selected page).

b. Compute the expected number of typing errors on a page, using the expression

E(x) = ∑[x • P(x)].

c. Compare your answer in part b to the value of λ.

d. Compute the variance for the distribution using the general expression

σ2 = ∑[(x ─ E(x))2 • P(x)].

e. Compare your answer in part d to the value of λ.

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