exam Maths Puzzle Numerical Ability

The batteries used in a digital watch have an operating life that is normally distributed. As sample of 16 batteries reveals a mean of 3.45 years and a standard deviation of 0.3 y

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exam Other Question

Graph the following equations and find the slope of each line:
2x+4y=8
x-2y=6
y=2/3x=2
y=4

Also, finding the slope of the following points:
(6,5) and (3,3)
(4,2) and (1,6) what is the minimum score needed to make on the 5th test so that the mean test score is at least 85? The first 4 test were 87, 92, 76, and 89