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I think you left off some important information. Perhaps you can supply this information, to obtain assistance.

To calculate the probability or the chance of occurrence between two values, we calculate:

Pr{a < X < b} = F(b) - F(a)

where F(x) = cumulative probability distribution. The distribution requires certain known parameters. In the case of the Normal distribution, the mean and standard deviation are parameters.

In your particular case, a = 20 and b = 28.

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