Maths - Mead, Meadian, and Mode

 Writing a blog post explaining what mean, median, and mode mean. 

 

Mean-The mean is the average of the numbers. It is easy to calculate: add up all the numbers, then divide by how many numbers there are. In other words, it is the sum divided by the count.

Identify - 10 + 10 + 10 = 30 divide by 3 = 10.

 This means 10 is the means  

when was it invented - The Belgian statistician Quetelet (1796-1874), famous as the inventor of l'homme moyen, the average man, was one of the first scientists to use the mean as the representative value for an aspect of a population.

 Median - The median is the middle number in a sorted, ascending or descending, list of numbers and can be more descriptive of that data set than the average. The median is sometimes used as opposed to the mean when there are outliers in the sequence that might skew the average of the values. 

Identify - 1, 3, 3, 6, 7, 8, 9

 Median = 6

when was it invented - Antoine Augustin Cournot in 1843 was the first to use the term median for the value that divides a probability distribution into two equal halves. 

 Mode - The mode is the value that appears most frequently in a data set. A set of data may have one mode, more than one mode, or no mode at all. Other popular measures of central tendency include the mean, or the average of a set, and the median, the middle value in a set.

Identify  - 1, 1, 1, 3, 5, 5, 7 

The mode is 1 because it appears more frequently on the set

when was it invented - An early use of the statistical concept of the mode was by English mathematician Karl Pearson (1857-1936) in 1895 when he stated that “I have found it convenient to use the term mode for the abscissa corresponding to the ordinate of maximum frequency”  

Maths - Area

 Area -  the area can be defined as the space occupied by a flat shape or the surface.

Area of the basic shape

Rectangle

Triangle

  

Circle

Maths convertion

 

Mm                                  cm                                 M                                   Km

12000mm	1200cm	12M	0.012
5000mm	500cm	5M	0.005
1200000mm	120000cm	1200M	1.2Km
326mm	32.6cm	0.326M	0.000326km
1200mm	120cm	1.2M	0.0012Km

Parts of a tree - VOT

 Task 1 - leaves - the  leaves are apart of a tree it is connected to the branch 

                       Branch - it is a part of the tree that grows from the trunk

                        Crown - refers to the total of an individual plant's aboveground parts

                        Twig  - are the smallest branches

                        Trunk - is the stem and is the main part of the tree

                        Roots - the part of the tree that is attached to the ground to help support the tree  

Task 2 -

Task 3 -Describe how trees become timber? The trees are cut down into the right lengths and then get transported to the timber mill where it is turned into the timber.

Task 4 - Describe and explain the different types of cuts?

              Quartersawn - The log is being cut in a radial angle into four quarters.

           plain sawn - is the most common type of cut. the annular rings are 30 degrees or less to                                                 the face of the board

            Rift sawn - is the most elite cuts the log is milled perpendicular to the growth rings which are 30-60 degrees to the face of the board

Task 5 - Give an example of timbers used in NZ?  KAURI, MATAI, BLACK PINE and RIMU

Task 6 - Give an example of defects in timber? Water stains, knots, Rind gals, shakes, and upsets

                

Basic Woodworking tools

 Different types of hand tools in a tech workshop.

Engineering set squares - is used as a marking and checking tool used to assess and mark straight lines. Made up of two straight pieces (stock & blade) that work together to create a right angle at exactly 90°.

Carpenters pencil: the reason why the shape is like this is that to stop it from rolling away. You can sharpen a carpenter's pencil by using a craft knife. 

Marking gauge - A marking gauge is used in woodworking to mark out lines for cutting or other purposes. The main purpose is to scribe a line parallel to a reference edge. 

Combination square - A combination square is a multi-use measuring instrument that is primarily used for ensuring the integrity of a 90° angle, measuring a 45° angle, measuring the center of a circular object, find depth, and simple distance measurements. It can also be used to determine level and plumb using its spirit level vial.

Sliding bevel - A sliding T bevel, also known as a bevel gauge or false square is an adjustable gauge for setting and transferring angles. Different from the square, which is fixed and can only set a 90° angle, the sliding T bevel can set any angle and transfer it to another piece.

 

 

   

Maths

How to convert millimeters to meters?

In maths today we learned how to convert mm to m you need to move your decimal point 3 places to the left to covert mm to m. I will be showing you how to convert mm to m.

For example :

4700mm  = 4.7m

8700mm = 8.7m

7262mm = 7.262

12000mm =  12m

 

science - windracer

Today Myself and Michael done  our research about wind racers.we found out that the  best sail you  need is a plastic  bottle cut out into square.

Equipment

-plastic bottle cut out into square x3

-tape 

-hot glue gun

- little piece of wood 15 x 30

-skewers

-plastic straws x4

bvvb