4. Aircrew escape systems are powered by a solid propellant. The burning rate of this propellant is an important product characteristic. Specifications require that mean burning rate must be 50 centimeters per second. The experimenter selects a random sample of 25 propellants and obtains a sample average burning rate of 48.7 centimeters per second with standard deviation of 2 centimeters per second. What conclusion can be drawn from the samples?
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