X=-1 find the value of x

The number of potato chips in a bag is normally distributed with a mean of 71 and a standard deviation of 2. approximately what percent of bags contain between 69 and 73 potato chips? approximately 68% approximately 71% approximately 95% approximately 99.7%

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Ming says that 0.24 > 1/4 because 0.24= 2/4. which best explains mings error