numbers of SPAM EMAILS received by 750 DKIT computing students over a one week period‚ were recorded as follows: No of SPAM EMAILS Received | Number of students | less than 5 | 68 | between 5 and 10 | 176 | between 10 and 15 | 244 | between 15 and 20 | 193 | between 20 and 25 | 42 | between 25 and 30 | 27 | (i) Calculate the mean number of SPAM emails received by a computing student. (4 marks) (ii) Construct a histogram for the data. Use it
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that is written first and negative half is written second. Subscripts are small numbers to the lower right of a symbol. They the number of atoms of that element in the compound. Coefficients are large numbers to the left of formulas in chemical equations. They represent the ratio of molecules of each substance involved in a chemical reaction. Weight Percentage is a percentage based on weights. Mole percentage is a percentage based on the numbers of atoms or moles. Formula units is the simplest
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generalisations can be made between mathematical concepts. Furthermore‚ this report shall examine how teaching and learning theories influence the way in which we understand maths through the process of problem solving‚ generalisations‚ assumptions and proof‚ and also the common errors and misconceptions that may result from this. THE HISTORY OF MATHS From around 2000BC the Babylonian civilisation brought a style of mathematics which succeeded the Sumerian-Akkadian system following their invasion of Mesopotamia
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pi r^2 + 2 pi r^2 + 2pi r h‚ or 4 pi r^2 + 2 pi r h. Substitute h = 355 / (pi r^2) into this to get the surface area in terms of just r. Now that you have the surface area in terms of just r‚ you can find the value of r that minimizes this by taking the derivative‚ stetting it equal to 0‚ and solving for r. Use that to find h. You’ll find that the dimensions are different from an actual soda can‚ but I’m sure you can think of why this is the case. THE MATH PROBLEM: The surface area of
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Experiment Density‚ Accuracy‚ Precision And Graphing OBJECTIVES 1. The determination of the density of water 2. A comparison of the accuracy and precision of a graduated cylinder and a pipet EXPERIMENTAL MATERIALS Part A A 50mL graduated cylinder A balance 50.0mL deionized water A rubber policeman Part B A 100mL beaker A 50mL graduated cylinder A volumetric pipet 120.0mL deionized water A thermometer A rubber policeman
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Week Two Quiz Chapter 4 Tissues ________________________________________ 1. The four primary tissue types are a. epithelial‚ cartilage‚ muscle‚ and brain. b. connective‚ eipithelial‚ skin‚ and blood. c. epithelial‚ connective‚ muscle‚ and nerve. d. glands‚ bone‚ lungs‚ and kidney. e. bone‚ skin‚ blood‚ and muscle. 2. Epithelial tissue is characterized by a. tightly packed cells. b. absence of any basement membrane. c. extensive extracellular matrix. d. a rich blood supply
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Labs 4 & 5 Lab Four: Experiment 1 1. At what magnification do you first notice the ragweed pollen? I first noticed it when the magnification is at about 30 2. Which is bigger‚ rhinovirus or E. Coli? E. Coli is bigger 3. Based on the magnification‚ how many of the E. Coli can fit into the same space as the head of a pin? 10‚000 E. Coli 4. About how many red blood cells could fit across the diameter of a human hair. (Again‚ look at the magnification scale)? About 100 blood cells
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2/20/2014 Frequently Used Equations - The Physics Hypertextbook Frequently Used Equations Mechanics velocity Δ s v= Δ t ds v= dt acceleration Δ v a= Δ t dv a= dt equations of motion v = 0+at v x =x0+v 0 +½ 2 t at weight W =m g momentum p =m v dry friction ƒ μ =N centrip. accel. v2 ac = r 2 ac =−ω r impulse J =F Δ t impulse–momentum F Δ= Δ t m v J =⌠ dt F ⌠ dt =Δ F p ⌡ kinetic energy potential energy ⌡ K =½ mv
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Week 4 Practice Problems 11. List the five steps of hypothesis testing‚ and explain the procedure and logic of each Step 1: During this step of hypothesis testing‚ the query is stated again as a research theory and a null theory regarding the populations. The null and research hypothesizes are the opposites of each other. This step is necessary because it explains the theory and recognizes the populations‚ which will be worked throughout the study. Step 2: During this second step‚ the characteristics
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This document of ECO 203 Week 2 Quiz shows the solutions to the following problems: 1. The term “recession” refers to a 2. Who is NOT a loser in inflation? 3. The transfer of funds from savers to business investors takes place in the 4. If taxes increase and the AS curve is upward sloping‚ then 5. The turning points of the business cycle are called 6. As an economy recovers from a trough in the business cycle‚ 7. Short-term unemployment while searching for a new job
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