44. The prehahilit}r that a eall te an Ell'gy help line is answered in less than 1D seeends is [1.3. Assume that the ealls are independent ef eaeh ether. Using the nernial appresiinatien fer binernial with a eerreetien fer eentinnitjg the prehahilit}r that at least T5 ef l ealls are answered within 1D seeends is appresii'natel}F a) 0.8 b) [1.1313 e) .9154 a) [1.5sz e) esss:r