Or, if you're familiar with the empirical rule and the basic properties of the normal distribution, you can use the fact that approximately
which means about
Because the distribution is symmetric, you have
Based on the experimental results, how many rolls of 2 would you expect to get in a new experiment with 75 trials
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Or, if you're familiar with the empirical rule and the basic properties of the normal distribution, you can use the fact that approximately
which means about
Because the distribution is symmetric, you have