Check my The Crossett Trucking Company claims that the mean mass of its delivery trucks when they are fully loaded is 2300 kg and the standard deviation is 74 kg. Assume that the population follows the normal distribution. Forty trucks are randomly selected and their masses measured. Within what limits will 95% of the sample means occur? (Round the final answers to the nearest whole number.) Sample means toIt has been estimated that 23% of all university students switch majors within their first two years of starting classes. If a random sample of 410 thirdyear students is taken at a city university, what is an estimate of the probability that 20% or less had switched majors within their firsttwo years? Use agpendix 331 for the zvalues. (Round the z-value to 2 decimal places and the final answer to 4 decimal places.) Probability