The following data represent the number of people aged 25 to 64 years covered by health insurance (private or government) in 2018. Approximate the mean and standard deviation for age. high-temperature distribution for a summer.
Age 25-34 35-44 45-54 55-64
Number (millions) 22.8 36.8 33.7 25.8
Mean _____
Standard Deviation ______
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