For determining half-lives of radioactive isotopes, it is important to know what the background radiation is in a given detector over a specific period. the following data were taken in a y-ray detection experiment over 98 ten-second intervals: assume that these data are observations of a poisson random variable with mean lambda. (a) find the values of x and s^2. (b) what is the value of the maximum likelihood estimator of lambda? (c) is s^2 an unbiased estimator of lambda? (d) which of x and s^2 would you recommend for estimating lambda? why? you could compare the variance of x with the variance of s^2, which is