You are determining how to price a new type of babysitting service targeted to young single working moms. In order to do this you need to estimate this population's income. You know that the standard deviation is approximately $2175. What sample size will you need to estimate the mean to within $1000 with 95% confidence? Please round your answer UP to the nearest whole number and avoid any decimals (example: 6.3 should round to 7).