Blood Types The number of recognized blood types between species is given in the following table. In Exercise 43 of the previous section, the mean was found to be 7.38. Source: The Handy Science Answer Book.
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a. Find the variance and the standard deviation of these data.
b. How many of these animals have blood types that are within 1 standard deviation of the mean?
a. variance $=14.76, \quad$ st.dev $=3.84$
b. $10 .$
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