2. A set of Midterm examination grades in an introductory statistics course is normally distributed, as following: Name Grade Name Grade 80 60 Hakim 60 Hadi Joko 70 Ilham Budi 60 Ana 80 Ani Aji 70 Anisa 90 Siti 80 a. Calculate mean and standard deviation b. What is the probability that a student scored below 90 on this exam? C. What is the probability that a student scored between 70 and 80? 88888

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
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ISBN:9780079039897
Author:Carter
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Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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2. A set of Midterm examination grades in an introductory statistics course is normally distributed, as
following:
Name
Grade
Name
Grade
Hakim
60
Hadi
80
Joko
70
Ilham
60
Budi
60
Ana
80
Ani
80
Aji
70
Anisa
90
Siti
80
a. Calculate mean and standard deviation
b. What is the probability that a student scored below 90 on this exam?
C. What is the probability that a student scored between 70 and 80?
d. The probability is 20% that a student taking the test scores higher than what grade?
Transcribed Image Text:2. A set of Midterm examination grades in an introductory statistics course is normally distributed, as following: Name Grade Name Grade Hakim 60 Hadi 80 Joko 70 Ilham 60 Budi 60 Ana 80 Ani 80 Aji 70 Anisa 90 Siti 80 a. Calculate mean and standard deviation b. What is the probability that a student scored below 90 on this exam? C. What is the probability that a student scored between 70 and 80? d. The probability is 20% that a student taking the test scores higher than what grade?
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