Rin incorrectly calculated the mean absolute deviation for the data set 25,25,31,36,38.her work is shown here. 1. find the mean. mean = 25 + 25 + 31 + 36 + 38 5 = 155 5 = 31 2. find each absolute deviation. absolute deviations: 6,6,0,5,7 3. find the mean absolute deviation. mad = 6 + 0 + 5 + 7 4 = 18 4 = 4.5 in which step did rin make an error?

Rin did mistake in 3rd step

Step-by-step explanation:

Mean is correct  according to rin's calculation

Absolute mean deviation is  |data value-mean|

Hence, values of absolute deviations are also correct

To find the Mean absolute deviation we sum the differences of absolute deviations and then divide by the number of observations

it should be 6+6+0+7+5=24/5=4.8

Not 18/4

Hence, Rin did mistake in 3rd step

36 girls

step-by-step explanation:

the 48 boys is 4 parts of the ratio

divide 48 by 4 to obtain one part of the ratio

= 12 ← 1 part of the ratio

3 parts = 3 × 12 = 36 ← number of girls

the answer is (-4,-4)

hope this ! : d