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Wt of officers make more than 20 arrests per month what


The number of arrests in the 24th Precinct are normally distributed with the average of 15 per month and standard deviation of 5. Use the z-table to answer...

  1. What % of officers make more than 20 arrests per month?
  2. What % of officers make between 10 and 18 arrests per month?
  3. What number of arrests is the benchmark for officers who are in the top 10% of monthly arrests?

STANDARD ERROR

Define standard error:

Formula:

1. A population has a standard deviation σ of 26 units. (Give your answers correct to two decimal places.)

(a) Find the standard error for the mean if n = 25.

(b) Find the standard error for the mean if n = 47.

(c) Find the standard error for the mean if n = 89.

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