The National Opinion Research Center administered the General Social Survey (GSS) in 2010 to randomly selected persons in the United States 18 years of age or older. One question participants were asked was, "How many children have you ever had?" Another question asked, "How old were you when your first child was born? " Below are responses of 10 randomly selected people. table of paired data for age when first child born and number of children mean st. dev Age 1st Child Born 13 15 18 21 22 25 32 37 41 55 27.9 13.262 Number of Children 8 4 6 4 3 4 12 3 1 2 3.7 2.057 Using the data above, the least squares regression line is: y = 6.95 - 0.12x where y is the total number of children had by a person who was x years old when his or her first child was born. Use the above equation to predict the average number of children had by all people who were 30 years old when his or her first child was born. Round answer to 1 decimal place