Quantitative Literacy Practice Exam 2025 – Comprehensive Preparation Guide

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What calculation would you perform to determine how many standard deviations a value is from the mean?

Subtract the mean from the value and divide by the standard deviation

To determine how many standard deviations a value is from the mean, the correct calculation involves subtracting the mean from the value and then dividing by the standard deviation. This calculation gives you the z-score, which quantifies how far away a specific value is from the average (mean) in terms of standard deviations.

This process effectively standardizes the value, allowing for comparisons across different distributions. By subtracting the mean from the value, you ascertain the difference between the two; then, dividing this difference by the standard deviation scales this difference, revealing how many standard deviations the value lies away from the mean.

This approach is foundational in statistics, especially when analyzing data distributions and identifying outliers. It helps in assessing whether a data point is typical or unusual compared to the overall dataset.

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Add the mean to the value and multiply by the standard deviation

Multiply the value by the mean and add the standard deviation

Calculate the mean of the standard deviations

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