4a. {1 mark] The heights of apple trees in an orchard are normally distributed with a mean of 3. 42 m and a standard deviation of III. 21 or. Write down the probability that a randomly chosen tree has a height greater than 3. 42 m. 4b. {I mark] 1.Iluirite down the probability that a randomly chosen tree will be within 2 standard deviations of the mean of 3. 42 m. 4c. [2 marks} Use your graphic display calculator to calculate the probability that a randomly chosen tree will have a height greater than 3. 35 m. 4d. {2 marks} The probability that a particular tree is less than 1: metres high is II}. 65. Find the value of x