itsmichelle29
  • itsmichelle29
help medal and fan thanks help plz The ages of students in a school are normally distributed with a mean of 15 years and a standard deviation of 2 years. Approximately what percent of the students are between 14 and 18 years old? 24.17% 62.47% 30.85% 93.32%
Mathematics
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SOLVED
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katieb
  • katieb
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Michele_Laino
  • Michele_Laino
hint: you have to use the table of the "erf" function, with these limits: (15-14)/2 = 0.5 standard deviations below the mean (18-15)/2= 1.5 standard deviations above the mean
Michele_Laino
  • Michele_Laino
|dw:1438374302528:dw|
itsmichelle29
  • itsmichelle29
How do u do that'

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Michele_Laino
  • Michele_Laino
have you the tables of the "erf" function?
itsmichelle29
  • itsmichelle29
Yes
itsmichelle29
  • itsmichelle29
is that the z score chart
Michele_Laino
  • Michele_Laino
yes!
itsmichelle29
  • itsmichelle29
okay so now what do i do
Michele_Laino
  • Michele_Laino
I refer to this tables: |dw:1438374528068:dw|
Michele_Laino
  • Michele_Laino
if z= 1.5, then I got: area=43.32% please check on your tables
itsmichelle29
  • itsmichelle29
0.93
itsmichelle29
  • itsmichelle29
is that answer 62.47%
Michele_Laino
  • Michele_Laino
I prefer to explain step by step
Michele_Laino
  • Michele_Laino
if z=0.5, I got: area = 19.15%
Michele_Laino
  • Michele_Laino
so, we have: |dw:1438374751642:dw|
itsmichelle29
  • itsmichelle29
so im right thanks
Michele_Laino
  • Michele_Laino
yes! since: 19.15+43.2=62.47 %
Michele_Laino
  • Michele_Laino
oops..19.15+43.32=62.47%

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