6. Multiple sclerosis (MS) is an inflammatory disease in which the insu- lating

Question

6. Multiple sclerosis (MS) is an inflammatory disease in which the insu- lating covers of nerves cells in the brain and spinal cord are damaged. For most patients, MS begins with one or two isolated symptoms over a number of days. At the onset of the disease, 45% of patients have motor problems, 20% have optic neuritis (inflammation of the optic nerve) and 12% have both symptoms. What is the probability that an MS patient has neither one of these symptoms at the onset of the disease? A) 0.88 B) 0.47 C) 0.53 D) 0.65 E) 0.35

Explanation / Answer

P(motor) = 0.45

P(neutrient) = 0.2

P(motor and neutrient) = 0.12

P(motor or neutrient) = 0.45 + 0.2 - 0.12 = 0.53

P(neither motor nor neutrient) = 1 - 0.53 = 0.47

Option-B is the correct answer.

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