Test samples of mild steel rods are selected randomly from a large number of rods with mean strength 65 kips per rod and standard deviation 10 kips. Find the approximate values for the probability that 10 rods bundled together would have a combined strength (a) less than 680 kips, (b) less than 640 kips, (c) greater than 640 kips. (Hint: use the central limit theorem)

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