Assume the readings on thermometers are normally distributed witha mean of 0 degree C and a standard deviation of 1.00 degree C. Find the probability that a randomly selected thermometer reads less than -1.27 and if possible draw a graph Solution Given X~Normal(mean=0, s=1) So the probability is P(X<-1.27) =P((X-mean)/s <(-1.27)/1) =P(Z-1.27) = calculate the answer (check standard normal table).