Asked Jan 24, 2020

Vision Correction A survey sponsored by the Vision Council showed that 79% of adults need correction (eyeglasses, contacts, surgery, etc.) for their eyesight. If 20 adults are randomly selected, find the probability that at least 19 of them need correction for their eyesight. Is 19 a significantly high number of adults requiring eyesight correction?


Expert Answer

Step 1

Define the random variable x as the number of adults who need eyesight correction. Here, the total number of adults selected (n) is 20 and each person is independent of each other. Also, there are two possible outcomes (eyesight correction and without eyesight correction) and the probability of the selected adults who need eyesight correction is (p) 0.79. Thus, x follows binomial distribution.

Step 2

The binomial distribut...

Statistics homework question answer, step 2, image 1

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