A survey of 2296 adults in a certain large country aged 18 and older conducted by a reputable polling organization found that 427 have donated blood in the past two years. Complete parts (a) through (c) below. Click here to view the standard normal distribution table (page 1). Click here to view the standard normal distribution table (page 2). (a) Obtain a point estimate for the population proportion of adults in the country aged 18 and older who have donated blood in the past two years. (Round to three decimal places as needed.)