lesson 2.5, problem10, finding out the central tendency that best describe data. I don`t get it because I don`t know what the question is asking. Is it asking what is better mean,medium, or mode? Also i don't know how to answer the question.

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SReisner

09/23/2012 5:54pm

They are asking which is the better description of the center of the data - mean, median, or mode. Median is better when there is a true outlier, mode is better when most of the data is the same exact number, and otherwise you can use mean. Sometimes the mean and median both work, such as when there is a clump of data in the middle and no outlier. Let me know if this helps, or if you need more.

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Makayla C

09/22/2012 9:21pm

Lesson 1.4, problems 24-29. I don't really understand the Multiplication Properties and Properties of Equality anyway, and the question gets really hard and confusing for me when it asks me to name the property used in each step after I evaluate. I always miss these questions on a lesson or test.

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SReisner

09/23/2012 5:56pm

Naming each property will mostly be required only in Chapter 1. However as a mathematician you should know WHY you are allowed to do some of the steps in solving an equation.

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Theresa L

09/23/2012 2:44pm

I don't understand lesson 1.4. problems 24-29 either. I have a hard time remembering the names of the properties and I don't do the steps right, so that throws me way off. By looking at my test I can tell that I also have a hard time adding and subtracting rational numbers which would be lesson 2.2 problems 39-56.

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SReisner

09/23/2012 5:59pm

See reply above for info on properties. For Rational numbers, that is just another name for adding and subtracting fractions and decimals, which we did a lot with. I think the problem is the negative numbers combined with them. You need to adjust your thinking about integers to include fractions and decimals. If the numbers have different signs, then the answer gets the sign of the bigger number and you find the difference of the two number.

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Lyndsey P.

09/23/2012 5:55pm

I do not understand Lesson 1.4 either numbers 24-29 because I can not remember the properties. I also have a hard time with Lesson 2.5 number 10 I do not know why that Measure of Central Tendency best describes the data. Also Lesson 2.2 numbers 39-56 are kinda hard only because I don't know whether to make the answer positive or negatrive. EXAMPLE: problem 40 I don't know wether to make that answer positive or negative.

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SReisner

09/23/2012 6:02pm

See Destiny's question and reply for measures of central tendency.

If the two numbers have different signs, then you give the answer the sign of the biggest number and find their difference. If the two numbers have the same sign then you add the numbers and keep their sign.

I guess if you all like to ask questions on the blog, especially on the weekend, then I will have to take a book home so I can look up the problems you are asking about!

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Mrs. Reisner

Middle School Algebra Teacher PI-rate joke teller.