Common Assessment 4 PORTION

Mean, Mode and Median

A video of your understanding

Where do you apply averages in real life ?

Functions

A video on functions

 

 

What is functions?

A function can be defined by any mathematical condition relating each argument (input value) to the corresponding output value.

 The input and output of a function can be expressed as an ordered pair, ordered so that the first element is the input (or tuple of inputs, if the function takes more than one input), and the second is the output. In the example above, f(x) = x², we have the ordered pair (−3, 9). If both input and output are real numbers, this ordered pair can be viewed as the Cartesian coordinates of a point on the graph of the function. But no picture can exactly define every point in an infinite set.

What are the situations that functions can help with ?

Common Assessment (4) Schedule

DATE	SUBJECT
6th May 2015	ENGLISH  &  ISLAMIC STUDIES / LIFE SKILLS
7th May 2015	MATH  &  SECOND LANGUAGE ( FRENCH / URDU )
10th May 2015	SCIENCE  &  ARABIC ( REGULAR & SPECIAL )
11th May 2015	COMPUTER STUDIES  &  SOCIAL STUDIES

Statistics: Frequency Table ( In groups)

Class Intervals (or Groups)

When the set of data values are spread out, it is difficult to set up a frequency table for every data value as there will be too many rows in the table.  So we group the data into class intervals (or groups) to help us organise, interpret and analyse the data.

Ideally, we should have between five and ten rows in a frequency table.  Bear this in mind when deciding the size of the class interval (or group).

Each group starts at a data value that is a multiple of that group.  For example, if the size of the group is 5, then the groups should start at 5, 10, 15, 20 etc.  Likewise, if the size of the group is 10, then the groups should start at 10, 20, 30, 40 etc.

The frequency of a group (or class interval) is the number of data values that fall in the range specified by that group (or class interval).

Question: Where is frequency used in real life?

Statistics: Frequency Tables (Individual)

Frequency and Frequency Tables

The frequency of a particular data value is the number of times the data value occurs. For example, if four students have a score of 80 in mathematics, and then the score of 80 is said to have a frequency of 4.  The frequency of a data value is often represented by f. A frequency table is constructed by arranging collected data values in ascending order of magnitude with their corresponding frequencies. Example The marks awarded for an assignment set for a Year 8 class of 20 students were as follows:      6     7     5     7     7     8     7     6     9     7      4     10   6     8     8     9     5     6     4     8 Present this information in a frequency table. Solution: To construct a frequency table, we proceed as follows: Step 1: Construct a table with three columns.  The first column shows what is being arranged in ascending order (i.e. the marks).  The lowest mark is 4.  So, start from 4 in the first column as shown below. Step 2: Go through the list of marks.  The first mark in the list is 6, so put a tally mark against 6 in the second column.  The second mark in the list is 7, so put a tally mark against 7 in the second column.  The third mark in the list is 5, so put a tally mark against 5 in the third column as shown below. We continue this process until all marks in the list are tallied. Step 3: Count the number of tally marks for each mark and write it in third column.  The finished frequency table is as follows:

 Question: Make a data with a frequency table in Microsoft Excel and upload it on the comments (Individual data). 

Reminder : Timetable Change

Students, there is a timetable change for now. I will inform you right away.

Monday 6th period PE is shifted to Sunday 5th period

Wednesday 3rd period Computer Studies is shifted to Sunday 1st period

Tuesday 1st period Computer Lab is shifted to Wednesday 3rd period

Sunday 1st period English is shifted to Monday 6th period

Sunday 5th period Geography is shifted to Tuesday 1st period

Note: There is NO English on Sunday

           There are 2 English periods on Monday

Acids

What is an acid?

• An acid is a solution that has an excess of H+ ions. It comes from the Latin word acidus that means "sharp" or "sour".

• The more H + ions, the more acidic the solution.

Properties of an Acid

• Tastes Sour
• Conduct Electricity
• Corrosive, which means they break down certain substances. Many acids can corrode fabric, skin,and paper
• Some acids react strongly with metals
• Turns blue litmus paper red

 Uses of Acids

• Acetic Acid = Vinegar
• Citric Acid = lemons, limes, & oranges. It is in many sour candies such as lemon head & sour patch.
• Ascorbic acid = Vitamin C which your body needs to function.
• Sulfuric acid is used in the production of fertilizers, steel, paints, and plastics.
• Car batteries

Q:
   Name some strong acids and the pH values?

 

pH Scale

pH Scale

pH Scale

• pH is a measure of how acidic or basic a solution is.
• The pH scale ranges from 0 to 14.
• Acidic solutions have pH values below 7
• A solution with a pH of 0 is very acidic.
• A solution with a pH of 7 is neutral.
• Pure water has a pH of 7.
• Basic solutions have pH values above 7.
• A change of 1 pH unit represents a tenfold change in the acidity of the solution.
•  For example, if one solution has a pH of 1 and a second solution has a pH of 2, the first solution is not twice as acidic as the second—it is ten times more acidic

pH Scale