On any given day, the number of telephone calls that Daniel receives is a random variable with probability distribution given by

1. Find the mean of  .   (2 marks)
   

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2. What is the probability that Daniel receives only one telephone call on each of three consecutive days?   (1 mark)
   

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3. Daniel receives telephone calls on both Monday and Tuesday.

    

   What is the probability that Daniel receives a total of four calls over these two days?   (3 marks)
   

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