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drek231 [11]
3 years ago
13

Com a entrada da Rita a classe ficou com 20 alunos a média das idades destes 20 alunos é 13,2 anos

Mathematics
1 answer:
Harman [31]3 years ago
8 0

Answer:

New avaerage if 2 students (15 year old) left = 13

Step-by-step explanation:

Given:

Average age of 20 students = 13.2

Find:

New avaerage if 2 students (15 year old) left

Computtaion:

Sum of all 20 student's age = 20 x 13.2

Sum of all 20 student's age = 264

Sum of current 18 student's age = 264 - 15 - 15

Sum of current 18 student's age = 234

New avaerage if 2 students (15 year old) left = 234 / 18

New avaerage if 2 students (15 year old) left = 13

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From the tree diagram we can see that:

P(F) = 0.45
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Using the values, we get:

P(F∩P) = 0.45 x 0.65 = 0.2925

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Answer:

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