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Using the normal distribution, we can estimate a range of values which we expect to contain the mean. For example, if we take a sample of 30 students height, we can estimate the mean height of students in...

1. Start by writing the equation out again: x² + 5x + 6 = 0

2. I do it by thinking which two numbers add together to = 5 and which same two numbers multiply to = 6. The an...

i) (2sqrt(7))² = 2²  sqrt(7)² = 4 * 7 = 28      (1 mark) ii) First of all substitute the answer from above.    ((2 * sqrt(7))² + 8) / (3 + sqrt(7)) = (...

64/4/4=4

4x4=16

n.b no square root function on my divice

0.125 is the same as 125/1000. This is because we have to remove the decimal point before creating a fraction. So 0.125 times by 1000 is 125 and at this point the decimal point has been removed. But 125/1...