exam Maths Puzzle Numerical Ability

find the z score that separates the middle 63% of the distrubution from the area in the tails of the standard normal distribution
The z scores are___

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exam Other Question

A plan flies 300 miles with a tail wind in 1 hour. It takes the same plan 2 hours to fly the 300 miles when flying against the wind. What is the plane's speed in still air? use the intercepts to graph the equation.

x+3y=6