Suppose a set of test scores is appproximately bell-shaped, with a mean of 68 and a range of 54. (a) The minimum test score is approximately , and the maximum test score is approximately . (b) The standard deviation of the test scores is approximately g

a.) Minimum test score = 41

    Maximum test score = 95

b.)An approximate value of the standard deviation is 9.

Step-by-step explanation:

The given set of test scores is approximately bell shaped.

The mean of the test scores, = 68

The range of the data set = 54.

a.) i.) Minimum test score  =

   ii.) The maximum test score =

b.) From the 68-95-99.7 rule, also known as the Empirical rule, tell us that an approximation of the range is 3 standard deviations either way from the mean. So from this rule we can say that the minimum can also be found from and the maximum can also be approximated as .

From the above we can say that the range can be written as

∴  

∴    

Therefore an approximate value of the standard deviation is 9.

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im not sure

ca = ec

cpctc makes it so that corresponding parts of the triangle you proved to be equal are equal, the other options aren't part of the part of the triangles you proved to be equal.