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11.

Step-by-step explanation:

The scores 60-69 has two people. The scores 70-79 have 9 people. Both are lower or below 80.

11

Step-by-step explanation:

Add the number of people in the 60-69 range ( 2) and the number of people in the 70-79 range (9) to get the number of people below 80

2+9 = 11

16m

Step-by-step explanation:

If we're assuming the ratio of height to shadow lenght is the same then

5:4

also equals

20:16

so the tree is 16 m tall