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7. What is z when X = 45, u = 67, and o = 8? A-2.75 B. -0.55 C. 0.55 D. 2.75 ​

Sagot :

MakotoOrekiidn

Answer:

[tex] \therefore [/tex] The value of z or Z-score is approximately -2.75 (A.)

Step-by-step explanation:

To find the value of z or Z-score, we must use the Z-score formula:

  • [tex] \boxed{\bold{Z = \frac{x - \mu}{\sigma}}}[/tex]

Substitute the given to the formula.

  • [tex] Z = \frac{45-67}{8} [/tex]
  • [tex] Z = \frac{-22}{8} [/tex]
  • [tex] Z \approx -2.75 [/tex]

[tex] \therefore [/tex] The value of z or Z-score is approximately -2.75 (A.)