TABLE 6-4 John Has Two Jobs. for Daytime Work at a Jewelry

TABLE 6-4
John has two jobs. For daytime work at a jewelry store he is paid $200 per month, plus a commission. His monthly commission is normally distributed with mean $600 and standard deviation $40. At night he works as a waiter, for which his monthly income is normally distributed with mean $100 and standard deviation $30. John's income levels from these two sources are independent of each other.
-Referring to Table 6-4, the probability is 0.2 that John's total income from these two jobs in a given month is less than how much?

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