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Precalculus Mathematics Homework Help
How Do You Use a Z-Score Table for Probability Calculations?
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[QUOTE="Mark44, post: 4939019, member: 147785"] You need parentheses when you write things like this. It should be z = (x - μ )/σ. As you wrote it, it would be interpreted as z = x - (μ /σ). No, the above should be P(X > 87). You get the z-score by transforming the inequality, like so: P(X > 87) = ##P(\frac{X - 80}{5} > \frac{87 - 80}{5}) = P(z > \frac{7}{5}) = P(z > 1.4)## No, the z-score is 1.4, and the probability associated with it is 0.9192. This probability is the area under the standard normal curve (the "bell curve") between -∞ and 1.4. It's very helpful to draw a quick sketch of the bell curve, including your z-score and the probability value you get from the table. With a sketch you can easily see which area under the curve you're interested in. [/QUOTE]
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Precalculus Mathematics Homework Help
How Do You Use a Z-Score Table for Probability Calculations?
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