A physician observes the number of lesions on subjects who regularly used tanning salons. Let X be the number of lesions observed. The physician found that X had the following probability distribution.
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$$\begin{array} { | l | l | l | l | l | l | }
\hline \text { Value of } \boldsymbol { X } & 0 & 1 & 2 & 3 & 4 \
\hline \text { Probability } & 0.05 & 0.1 & 0.25 & 0.30 & 0.30 \
\hline
\end{array}$$ What is the probability that a randomly chosen subject has at least three lesions?

Question

A physician observes the number of lesions on subjects who regularly used tanning salons. Let X be the number of lesions observed. The physician found that X had the following probability distribution.
?
?
$$\begin{array} { | l | l | l | l | l | l | } 
\hline \text { Value of } \boldsymbol { X } & 0 & 1 & 2 & 3 & 4 \
\hline \text { Probability } & 0.05 & 0.1 & 0.25 & 0.30 & 0.30 \
\hline
\end{array}$$ What is the probability that a randomly chosen subject has at least three lesions?

Quizplus · Accepted Answer

The probability that a subject has at least three lesions is the sum of the probabilities of having 3 or 4 lesions: 0.30 + 0.30 = 0.60.

A Physician Observes the Number of Lesions on Subjects Who