1.The weight and systolic blood pressure of 26 randomly selected males in the age group 25 to 30 are shown in the following table. Assume that weight and blood pressure are jointly normally distributed. Systolic Systolic Subject Weight ВР Subject Weight ВР 165 130 14 172 153 167 133 15 159 128 180 150 16 168 132 4 155 128 17 174 149 212 151 18 183 158 175 146 19 215 150 7 190 150 20 195 163 8 210 140 21 180 156 200 148 22 143 124 10 149 125 23 240 170 11 158 133 24 235 165 12 169 135 25 192 160 13 170 150 26 187 159 (a) Find a regression line relating systolic blood pressure to weight. (b) Test for significance of regression using a = 0.05 (c) Estimate the correlation coefficient.

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Average

In mathematics, everyone must have heard the term average in one place or other. Almost all types of calculation require taking out an average. In everyday life, the term is used for denoting a certain amount that can be said to be a typical quantity for multiple people or objects. In other words, if a group of people possesses a certain object, then the average gives us an idea regarding the quantity of the object possessed by each person. However, this is solely based on mathematical calculation. It is important to note that most people will not strictly have the average value in a group.