The annual earnings (in dollars) of 35 randomly selected microbiologists are shown in the data table. Use the data to (a) find the sample mean, (b) find the sample standard deviation, and (c) construct a 98% confidence interval for the population mean.
99,787, 80,717, 77,403, 68,172, 51,312, 68,142, 94,108, 65,903
79,143, 74,503, 44,731, 87,244, 60,749, 57,817, 55,126, 78,738
47,902, 99,445, 80,392, 92,412, 63,943, 74,342, 51,108, 60,736
92,334, 84,077, 80,265, 64,130, 74,307, 56,545, 47,168, 89,562
75,338, 61,842, 82,989
a) Find the sample mean.
X=_____ (Type an integer or decimal rounded to two decimal places as needed.)