The following data represent the systolic blood pressure reading (that is, the top number in the standard

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The following data represent the systolic blood pressure reading (that is, the top number in the standard blood pressure reading) in mmHg for each of 20 randomly selected middle-aged males who were taking blood pressure medication.

138 153 134 136 126 109 141 127 159 139 151 144 107 132 111 150 144 116 121 113

a. Calculate the mean, median, and mode for these data.
b. Calculate the 10% trimmed mean for these data.

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