1. If the bearing of k from j is 165°, what is the bearing of j from k
2. Two dice are thrown together once. What is the probability of getting a product equal to 12?
3. The mean of the following set of marks:65,62,61,61,60,60,59,58,52 is 60. Calculate the variance?
#1 Just add or subtract 180°
#2 There are 36 possible throws. How many pairs of numbers are factors of 12? Remember that 3-4 and 4-3 are separate throws.
#3 Just plug your numbers into the formula. They have already said that x̅ = 60. So, use that in the formula:
∑(xi-x̅)2 / (n-1)