14.21 According to a local college’s NEWS website

(http://www.cincynet.cnyric.org/Computers/

Career/news"es.htm), 60% of high school seniors have mastered basic math—decimals, fractions, percentages, and simple equations. Suppose we wish to test the null hypothesis, “One-half of all seniors can solve problems involving fractions, decimals, and percentages,” against an alternative that the proportion who can solve is greater than one-half. Let  represent passed and  represent failed the test on fractions, decimals, and percentages.

If a random sample of 1500 students is tested, what value of x, the number of the least frequent sign, will be the critical value at the 0.05 level of significance?