Three major automobile manufacturers have entered their cars in the Indianapolis 500 race. The speeds (in miles per hour) of the tested cars are given below. Please note the sample sizes are not equal. Manufac Manufac Manufac A B C 176 175 180 172 180 175 179 169 178 153 175 189 Sample 173.80 174.75 177.67 mean Sample 174.70 20.25 6.33 Variance 1. Find the overall mean (Round to second decimal place.) Calculate SSTR (Round to second decimal place.)

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