7.6 A bed linen company manufactures duvets that have a mean TOG rating (a measure of thermal effectiveness) of 11.5 with a standard deviation of 0.18. If the TOG ratings are Normally distributed, what is the probability that a duvet selected at random has a TOG rating:

(a) Above 12?

(b) Above 11.3?

(c) Below 11.6?

(d) Below 11.1?

(e) Between 11.2 and 11.4?

(f) Between 11.5 and 11.9?