Normal approximation of the sampling distribution of a sumsuppose that the expected number of phone calls that are handled by a switchboard in each second is 5.35. assume that the distribution of the number of phone calls per second follows the poisson distribution. tasks 10-12 refer to this information. question 10the number of phone calls that the switchboard is expected to handle in 1 minute is question 11the 0.80-percentile of the number of calls per minute is (approximately) equal to: (use the normal approximation. the answer may be rounded up to 3 decimal places of the actual value.) ? question 12the probability that the switchboard will need to handle no more than 300 call in a minute is: (use the normal approximation, without a continuity correction. the answer may be rounded up to 3 decimal places of the actual value.)