kqbdiva
kqbdiva kqbdiva
  • 16-02-2017
  • Mathematics
contestada

A sample from a population with μ = 40 and σ = 10 has a mean of M = 44. If the sample mean corresponds to a z = 2.00, then how many scores are in the sample?​

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LammettHash
LammettHash LammettHash
  • 20-02-2017
[tex]z=\dfrac{M-\mu}{\dfrac\sigma{\sqrt n}}\iff 2.00=\dfrac{44-40}{\dfrac{10}{\sqrt n}}\implies \sqrt n=5\implies n=25[/tex]
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