Part A A variable Xhas mean of 185 5 and a standard deviation of 21 _4_ A random sample of size 67 is selected. Assuming Xis normally distributed, what is the probability, to two decimal places, that the sample mean exceeds 200? Give mr answer to two decimal places in the form xxx Answer 0_04 Part 8 True or False: It was necessary to assume that the variable x IS normally distributed in part (a) of this question. Answer by placing T or F in the space provided. Answer Suppose a random sample ot size 64 is selected from a population yielding a sample mean ot 26. The poou'atioutandard deviation is From this information, the confidence interval to estimate the population mean can be calculated 25_got026.10 25.36 to 26.64 25.92 to 26.08 25.18 to 26.82 Clear my choice The t-distributlon is similar to a normal distribution. However the t-distribution IS O bimodal flatter _ discrete not symmetric Clear my choice Considerthe tdistnbutlon with 55 degrees of freedom Use Excel to find the value ot tthat cuts off an upper tail of area 005 in this distributiom Give your answer to 3 decimal places in the form x_xxx Answer Activatf Go to Set: