Question: Consider the following grouped sample data: Values Frequency 10 to under 30 26 30 to under 50 35 50 to under 70 51 70 to

Consider the following grouped sample data:

Values Frequency 10 to under 30 26 30 to under 50 35 50 to under 70 51 70 to under 90 33

a. Calculate the approximate mean of these sample data.

b. Calculate the approximate standard deviation of these sample data.

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