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The 400m race times at a state track meet are normally distributed with a mean of 52.71 seconds and a standard deviation of 3.8 seconds.

The 400m race times at a state track meet are normally distributed with a mean of 52.71 seconds and a standard deviation of 3.8 seconds. Using the standard normal probabilities table, what is the approximate probability that a runner chosen at random will have a 400m time less than 53.4 seconds?

.8186

.2451

.4286

.5714

.7549

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