Dr. Cy Clopps is ophthalmologist and owner of the Spex Appeal Eye Clinic.  A review of 100 patient’s records indicated that 30 of these patients have vision insurance.  Further, 35 of the 100 patients got bifocal glasses but had no insurance.  Finally, 10 of the 100 patients had insurance but did not get bifocals.  a. Of those with insurance, what proportion got bifocals? b. Are the events independent?  Mutually exclusive?  Collectively exhaustive?

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