The California Municipal Corporation installed 2,000 bulbs in the streets of California. If these bulbs have an average life of 1,000 burning hours, with a standard deviation of 200 hours, what number of bulbs might be expected to fail in the first 700 burning hours? The table of area of the normal curve at selected values is as follows: X-X Sigma Probability 1.00 0.159 12.5 0.106 1.50 0.067

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