<prompt> If a 95 confidence interval for prevalence of cancer smokers aged 65 years is 56 to 76, the chance that the prevalence could be less than 56 is-Nil442.505  <response>: Ref:Parks 23rd edition pg 849. 1SD : confidence limit 68 2SD : confidence limit 95 3SD : confidence limit 99.7 Given, 95 values lie between 56 and 76 So, 5 values lie below 56 and above 76 altogether . So, 2.5 lies below 56. 