4. A group of 20 dogs are divided into two groups, A and B, for a veterinary study comparing two different brands of flea medicine. The table below gives the relative frequency of the number of times a dog had fleas over a four-year period. Calculate the mean number of times a dog had fleas from each group. Round your answers to 1 decimal place. Number of times a dog had fleas Frequency (Group A) Frequency (Group B) 0 3 \frac{3}{10} 2 \frac{2}{10} 1 3 \frac{3}{10} 3 \frac{3}{10} 2 2 \frac{2}{10} 3 \frac{3}{10} 3 1 \frac{1}{10} 1 \frac{1}{10} 4 0 1 \frac{1}{10} 5 1 \frac{1}{10} 0 Mean of Group A: Mean of Group B:
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To do this, we need to find the sum of all the numbers in Group A and then divide it by the total number of values in Group A. The sum of Group A is: 0 + (22/10) + (3/10) + (22/10) + (11/10) + (1/10) + (4/10) + 0 + 1 To add fractions, we need to have a common Show more…
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