a)The diameters of Ping-Pong balls manufactured in a factory are normally distributed with mean of 3cm and standard deviation of 0.2cm. The smallest 8% of Ping-Pong balls(interms of diameter) are sent back to the manufacturer. So what's the max diameter for the returned Ping-Pong balls. b) The owner of a pharmacy wants to find out how long it takes to do home deliveries to customers. he Recorded no. of days it took to do each delivery. What is the expected number of days for a delivery.

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