7.
The table shows the height (m) of 30 selecteal trees in a forest.
a) Find the nean height of the trues
b) Calculate comrect to one derimal place, the:
i. median ii. mean deriation
8. Two towns \( B \) and \( F \) on the equater are on longitude \( 67^{\circ} \equiv \) and \( 123^{\circ} \mathrm{E} \) respectively.
ii) Illustrate the information in a diagram
(ii) Find the distance between B and \( F \) along the equator.
(iii) How far is \( B \) from the north pole. Take \( R=6400 k_{n} \) \( j=22 / 7 \)
9.
A compeniy bid for two contracts \( T \) and \( J \). The probabilities that it will win contract \( T \) and \( J \) are \( 1 / 5 \) and \( 13 / 8 \) respectivecty. Find the probability that the company wins:
i) buth contracts
(ii) only one contract.
