A community for students.
Here's the question you clicked on:
 0 viewing
itsmichelle29
 one year ago
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%
itsmichelle29
 one year ago
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%

This Question is Closed

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1hint: you have to use the table of the "erf" function, with these limits: (1514)/2 = 0.5 standard deviations below the mean (1815)/2= 1.5 standard deviations above the mean

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1dw:1438374302528:dw

itsmichelle29
 one year ago
Best ResponseYou've already chosen the best response.0How do u do that'

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1have you the tables of the "erf" function?

itsmichelle29
 one year ago
Best ResponseYou've already chosen the best response.0is that the z score chart

itsmichelle29
 one year ago
Best ResponseYou've already chosen the best response.0okay so now what do i do

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1I refer to this tables: dw:1438374528068:dw

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1if z= 1.5, then I got: area=43.32% please check on your tables

itsmichelle29
 one year ago
Best ResponseYou've already chosen the best response.0is that answer 62.47%

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1I prefer to explain step by step

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1if z=0.5, I got: area = 19.15%

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1so, we have: dw:1438374751642:dw

itsmichelle29
 one year ago
Best ResponseYou've already chosen the best response.0so im right thanks

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1yes! since: 19.15+43.2=62.47 %

Michele_Laino
 one year ago
Best ResponseYou've already chosen the best response.1oops..19.15+43.32=62.47%
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.