1. 7.3 and 7.4 Extra Practice 7.3-7.4 Quiz: TOMORROW THIS REVIEW IS ON MY TEACHER WEB PAGE!!!

2. Section 7.3 Find the mean, median, and mode of the data set 1.12, 15, 17, 11, 8, 14, 7, 14 x = 12.25, Median = 13, Mode = 14 2.0.3, 8.9, 7.6, 3.7, 1.5, 4.2, 7.6, 8.1 x = 5.2375, Median = 5.9, Mode = 7.6

3. Section 7.3 Find the range and standard deviation of the data set. 1.1.25, 3.69, 5.67, 4.89, 0.12, 4.35, 2.78 Range = 5.55, Standard Deviation = about 1.8 2.515, 720, 635, 895, 585, 690, 770, 840 Range = 380, Standard Deviation = about 119.6

4. Standard Deviation x i – x( x i – x ) 2 Sum:

5. Section 7.4 A normal distribution has a mean x and standard deviation σ. Find the indicated probability for a randomly selected x-value from the distribution. 1.P(x < x + 2σ) 97.5% 2.P(x > x – σ) 84% 3.P( x - 3σ < x < x +σ) 83.85%

6. Section 7.4 Give the percent of the area under the normal curve represented by the shaded region. 2.5%50%

7. Section 7.4 A normal distribution has a mean of 63.7 and a standard deviation of 2.9. Find the probability that a randomly selected x-value from the distribution is in the given interval. 1.Between 57.9 and 66.6 81.5% 2.At most 69.5 97.5%

8. Section 7.4 A normal distribution has a mean of 496 and a standard deviation of 109. Use the standard normal table on p. 296 to find the indicated probability for a randomly selected x-value from the distribution. 1.P(x < 630).8849  88.49% 2.P(x < 270).0179  1.79%