A stem and a leaf plot includes how many columns

The value for a row below the median represents the total count for that row and all the rows below it. For each row, the number in the "stem" represents the first digit (or digits) of the sample values. The "leaf unit" at the top of the plot indicates which decimal place the leaf values represent.

38.5

step-by-step explanation:

lets say, first number = r

second number = 3r+7

total = 49

(r)+(3r+7)= 49

4r+7 = 49

4r = 42

r = 42/4

r= 10.5

3r+7 = 3(10.5)+7 = 38.5

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answer is 67%

step-by-step explanation: