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We are estimating the spares requirement for a radar power supply. The power supply was designed with a mean (μ) life of 6500 hours. The standard deviation (σ) determined from testing is 750 hours. What is the likelihood that a power supply would fail between 7225 and 7670 hours?

.4406 or 44.06%
.3340 or 33.40%
.1066 or 10.66%
.0444 or 4.44%

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