Math
posted by Debin .
Consider the following test scores obtained by a class.
Test score
90
80
70
60
50
Frequency
1
4
11
6
2
Find the standard deviation (rounded to the nearest hundredth).

Find the mean first = sum of scores/number of scores
Subtract each of the scores from the mean and square each difference. Find the sum of these squares. Divide that by the number of scores to get variance.
Standard deviation = square root of variance
I'll let you do the calculations.
Respond to this Question
Similar Questions

ALGBRA
Consider the following test scores obtained by a class. Test score 90 80 70 60 50 Frequency 1 4 11 6 2 Find the standard deviation (rounded to the nearest hundredth).  I've posted this question earlier … 
Math
Consider the following test scores obtained by a class. Test score 90 80 70 60 50 Frequency 1 4 11 6 2 Find the standard deviation (rounded to the nearest hundredth).  I've posted this question earlier … 
Math  Averages
The test average for Louis' calculus class is found by taking the arithmetic mean of his four best test scores. If his first four test scores are 65,82,76 and 87, what score must he get on the fifth test to raise his test average to … 
Statistics
A class obtained the following scores on a test. Test Score TestScore Frequency 90 1 80 6 70 10 60 3 50 2 40 3 What I did was 90+6(80)+7(10)+3(60)+2(50)+3(40)=1040 than divided by 25 which should give me the means it give me a fraction, … 
Algebra/can you ck my anwers
A class obtained the following scores on a test. Test Score Frequency 90 2 80 5 70 10 60 3 50 3 40 2 Find the mean, the median, the mode, and the range for the class. (If an answer does not exist, enter DNE.) 2(90)+5(80)+10(70)+3(60)+3(50)+4(40)than … 
statistics
1. Suppose you administered an anxiety test to a large sample of people and obtained normally distributed scores with a mean of 45 and a standard deviation of 4. Do not use the web calculator to answer the following questions. Instead, … 
Measures of Central Tendency
The table below shows the scores of a group of students on a 10point quiz. Test Score Frequency 3 0 4 2 5 2 6 1 7 2 8 3 9 0 10 4 The mean score on this test is: The median score on this test is 
FrequencyMath
The table below shows the scores of a group of students on a 10point quiz. Test Score Frequency 3 0 4 2 5 2 6 1 7 2 8 3 9 0 10 4 The mean score on this test is: The median score on this test is 
I need help, I'm stuck...what is the correct answe
The table below shows the scores of a group of students on a 10point quiz. Test Score Frequency 3 0 4 2 5 2 6 1 7 2 8 3 9 0 10 4 The mean score on this test is: 6.5 The median score on this test is: 7.5 
Measures of Central Tendency
The table below shows the scores of a group of students on a 10point quiz. Test Score Frequency 3 1 4 3 5 1 6 1 7 0 8 3 9 4 10 3 The mean score on this test is: The median score on this test is: