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A dump of our free Chat sessions, in case it is useful. It excludes white boards used during paid sessions.





tutor3 : Hello Student, May I help you with your Math problems?
student : What is the overall mean family size of the workers surveyed? Show how this is calculated. [4]
Income f Average Family size
Above $100,000 59 4.1
$75,000 – 99,000 32 3.8
$50,000 - 74,000 87 2.9
$25,000 – 49,000 55 3.2
Less than $25,000 21 4.5

tutor3 : the mean is calculated by the formula sum of all observations /total number of observations. So here sum of all observations = 594.1+323.8+872.9+553.2+214.5=2558.5 .The total number of observations are 5 . So the average family size or the mean is =2558.5/5 =511.7
student : k but u read the data incorrectly. can i repost it
tutor3 : sure
student : What is the overall mean family size of the workers surveyed? Show how this is calculated.
Income f avg family size
Above $100,000 59 4.1
$75,000 – 99,000 32 3.8
$50,000 - 74,000 87 2.9
$25,000 – 49,000 55 3.2
Less than $25,000 21 4.5

student : bigger number like $100,00 is the income 9along with everything underneath it. 59 represent the frequency and every number under 59 are all frequencies 4.1 is family avg size and everything under 4.1 is family size
tutor3 : ok.thanks.so this is a weighted average problem
student : i sent u the data at *****@aafter to enable u see the data acurately cos the space here shrinks the number and brings it close to one another
student : the numbers is seperated into 3
student : above100.00
tutor3 : so the formula for mean = F1x1 + f2x2 + f3x3 +….+ f5x5
tutor3 : divided by the sum of all frequencies
tutor3 : is Typing . . . . . . . . . . . . . . . . . . . . . . . . .


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