The following table relates the weights and
heights of a group of individuals participating in
an observational study. Hint: Fill out the table
first.
Weight/Height
Obese
Normal
Underweight
Totals
Tall Medium Short Totals
18
28
20
51
12 25
14
28
9
Find the probability that a randomly chosen
individual from this group is Tall given that the
individual is Obese.

Respuesta :

The probability of randomly chosen tall and obese individuals is 0.30.

Firstly complete the given table and find the total of each row and column.

                 Tall   Medium   Short   Total

Obese             18       28      14  60

Normal           20       51     28         99

Underweight   12       25       9  46

Total          50        104     51 205

We have to find P(Tall | Obese).

P(Tall | Obese) =  P(Tall and Obese) / P(Obese)

Now, P(Tall and Obese) = 18 ÷ 205

And, P(Obese) = 60÷205

Substituting the above values,

P(Tall | Obese) =  18÷205/ 60÷205

P(Tall | Obese) = 18/60

P(Tall | Obese) = 0.30

Hence the probability of a tall and obese individual is 0.30.

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