i) Given that 1050 persons texting are taken at random in 2 hours, answer the following questions given the standard normal table:

i) Find algebraically, the probability of using the normal approximation that one can obtain the number of text messages being less than or equal to the average number of text messages with an addition of 12 text messages.

iv) Find the value ofsuch that (| 34| < ) = 0.68. Hence, determine the limits within which the central 68% of the distribution lies.