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non008
 2 years ago
An orchestra consists of 25 members. The youngest member is 32 years old. She leaves and is replaced by a new member who is 30 years old.whaat is effect on average age , mean??
non008
 2 years ago
An orchestra consists of 25 members. The youngest member is 32 years old. She leaves and is replaced by a new member who is 30 years old.whaat is effect on average age , mean??

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deena123
 2 years ago
Best ResponseYou've already chosen the best response.2\[\huge\frac{ 32+x_2+....+x25 }{ 25 }=y\]

abhi7
 2 years ago
Best ResponseYou've already chosen the best response.0previously the average age is (x+32)/25..where x is the sum of ages of other 24 members..now i think you can tell what is the average age after 32 year member is replaced by 30 year old member..

deena123
 2 years ago
Best ResponseYou've already chosen the best response.2\[\huge \frac{ 30+x_2+.....+x25 }{ 25 }=w\]

deena123
 2 years ago
Best ResponseYou've already chosen the best response.2\[\huge \frac{25w+2}{ 25 }=y\]

deena123
 2 years ago
Best ResponseYou've already chosen the best response.2\[\huge w=\frac{ 25y2 }{ 25 }\]

deena123
 2 years ago
Best ResponseYou've already chosen the best response.2the mean of their ages will decrease by 0.08 ??

Directrix
 2 years ago
Best ResponseYou've already chosen the best response.0If A is the average age of the 25 people before the 32year old left, then 25*A is the sum of the ages. After the 32year old left and a 30year old joined, then (25*A  2)/25 is the new average age. (25*A  2)/25 = 25*A/25  2/25 = A  2/25 = A  8/100 = A  .08. So, does the average go down by .08 people? If so, I agree with @deena123

kropot72
 2 years ago
Best ResponseYou've already chosen the best response.0Let x = original average age. Original sum of ages = 25x New sum of ages = 25x  2 New mean is \[\frac{25x2}{25}=x0.08\]

Directrix
 2 years ago
Best ResponseYou've already chosen the best response.0> median?? @non008 Are you asking a second question?

non008
 2 years ago
Best ResponseYou've already chosen the best response.0no median of above question.

Directrix
 2 years ago
Best ResponseYou've already chosen the best response.0I did the average problem on a smaller case with 3 people and the same problem constraints as posted. The mean went down by 2/3 a point. So, I'm conjecturing that under the same conditions but with 100 people in the group, the mean would drop by 2/100 a unit. Just saying.

kropot72
 2 years ago
Best ResponseYou've already chosen the best response.0The median will not change when the age of the youngest player is reduced. The median is the middle value in a ranked set of data values.

non008
 2 years ago
Best ResponseYou've already chosen the best response.0thanks @Directrix and @kropot72

non008
 2 years ago
Best ResponseYou've already chosen the best response.0Weights of male mountain lions follow the normal distribution with a median of 140 lb and an interquartile range of 8 lb. How to find the 55th percentile??

pandu
 2 years ago
Best ResponseYou've already chosen the best response.02A : 2.0 POINTS Find the 75th percentile of the weights.

pandu
 2 years ago
Best ResponseYou've already chosen the best response.0PROBLEM 3 : 2.0 POINTS Undergraduates in a large university class were asked to record the time they spent on the most recent homework. In a histogram of the recorded times, the height of the bar over the interval “1 hour to 3 hours” is 4% per hour. The height of the bar over the interval “3 hours to 6 hours” is 2% per hour. If the histogram is redrawn with just a single bar over the interval “1 hour to 6 hours”, what should the height of the bar be? [Calculate your answer in % per hour, but do not enter the units of measurement.]

pandu
 2 years ago
Best ResponseYou've already chosen the best response.0The scatter diagram of midterm scores and final scores in a large class is football shaped. For about 80% of the students, the regression estimate of final score based on midterm score is correct to within 15 points. For about 95% of the students, the regression estimate of final score based on midterm score is correct to within ___________ points.
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