3 . The weights of adobe bricks used for construction follow a normal distribution with mean 50 pounds and standard deviation . 2 pounds ( 2 ) Only

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3 . The weights of adobe bricks used for construction follow a normal distribution with mean50 pounds and standard deviation . 2 pounds( 2 ) Only 12% of bricks are heavier than what weight ?( b ) We take a random sample of four bricks . Can you calculate the probability thatthe average weight of these four bricks is greater than 5 . I pounds ? If so calculatethe probability . If not , explain why not( C ) What is the probability that the total weight of a random sample of 50 bricks isless than 248 pounds ?( d ) Is the probability you calculated in ( c ) exact or approximate ? Explain

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