ladybugys
21.05.2020 •
Mathematics
The mean length of 6 childrens' big finger is 8.3cm. The mean length of 5 adults' big finger is 17.7cm. What is the mean length (rounded to 2 DP) of these 11 people's big finger?
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Ответ:
The mean for the whole group is 12.57 cm
Step-by-step explanation:
The mean of the length of each group's finger is given by the following formula:
mean = (sum of lengths from each finger)/number of people
Therefore for the first group:
8.3 = (sum1)/6
sum1 = 8.3*6 = 49.8
For the second group:
17.7 = sum2/5
sum2 = 17.7*5 = 88.5
Therefore the mean from the whole group is:
mean = (sum1 + sum2)/11 = (49.8 + 88.5)/11 = 12.57 cm
Ответ:
7
Step-by-step explanation: