Respuesta :

anchitthawi

[tex]z = \frac{x - u}{sd} [/tex]
when x is value (64)
u is mean (90)
and sd is satandard deviation (18)

so z = 64 - 90 / 18
z = -26 / 18 = -1.44

Answer:

It is -1.4! just took test

Step-by-step explanation: