Mathematics, 22.07.2019 20:20 unkown77

Acertain type of light bulb has an average life of 900 hours, with a standard deviation of 100 hours. the length of life of the bulb can be closely approximated by a normal curve. an amusement park buys and installs 10 comma 000 such bulbs. find the total number that can be expected to last more than 820 hours.

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