How do you get the z=1.89? Thank you

An education researcher claims that at most 2% of working college students are employed as teachers or teaching assistants. In a random sample of 700 working college students, 3% are employed as teachers or teaching assistants. At a = 0.05, is there enough evidence to reject the researcher's claim? Complete parts (a) through (e) below. While either the formula or technology could be used to find the standardized test statistic, for the purpose of this solution, use technology. Identify the sample proportion of successes p. p = 0.03 Some technologies require that the sample number of successes x be entered instead of the sample proportion of successes p. Use the relationship x = np to calculate x. x = np = 700(0.03) =21 Use technology to perform a right-tailed z-test for a proportion p with Ho : ps 0.02, Ha: p > 0.02, n =700, and x = 21. Identify the standardized test statistic z, rounding to two decimal places. Z = 1.89