9. Specimen Weight on Scale 1 Weight on Scale 2 14.36 8.33 23.42 9.15 13.47 12.40 6.47 13.52 6.46 19.38 10.50 10.52 23.41 11.23 11.27 14.41 8.35 9.17 12.45 19.35

LESSON 2.3 DENSITY CURVES AND THE NORMAL DISTRIBUTION vad E.C 23J Learning Target 2.3.190 ST A VALOR When will an enemy appear? Modeling with density curves PROBLEM: Suppose that a timer for a video game has a randomly determined length of time, after which an enemy appears. The timer is programmed so that the enemy is equally likely to appear any time between 0.25 minutes and 2.75 minutes after the timer starts. ta 35715 (a) Draw a density curve to model this distribution of random numbers. Be sure to include scales on both axes. (b) About what percent of the time will an enemy appear between 0.5 minutes and 2 minutes after the timer starts? (c) Find the 20th percentile of this distribution. AB Learning Target 2.3.2 Is it left skewed, too? Mean versus median PROBLEM: A density curve that models the distribution of a quantitative variable is shown. Identify the location of the mean and median by letter. Justify your answers. hewan way agad yun mubarb 10 Les 10 Leam - 197 con diweb eidt…

b. Sketch a standard normal curve and shade the area under the curve that lies between - 3 and - 2.1. Choose the correct graph below. А. В. С. OD. - 2.1 2.1 O 2.1 3 O 2.1 3 The area that lies between - 3 and - 2.1 is 0.98 (Round to four decimal places as needed.) N

Tea Bag Weight (in grams) 5.65 5.45 5.42 5.41 5.53 5.34 5.54 5.46 5.53 5.43 5.61 5.56 5.47 5.44 5.49 5.32 5.68 5.29 5.49 5.57 5.54 5.58 5.59 5.42 5.51 5.55 5.54 5.49 5.39 5.46 5.63 5.53 5.76 5.56 5.41 5.57 5.59 5.61 5.44 5.45 5.24 5.56 5.52 5.33 5.49 5.58 5.68 5.35 5.63 5.49 n