Question

X ~ N(60, 13). Suppose that you form random samples of 25 from this distribution. Let X

be the random variable of averages. Let ΣX be the random variable of sums.

• Part (f)

  Sketch the graph, shade the region, label and scale the horizontal axis for

  X,

  and find the probability. (Round your answer to four decimal places.)

  P(19 < X < 57) = .2032incorrect

• Part (g)

  Give the distribution of ΣX.
  ΣX ~

  n(1500, 325) 325 is incorrect

  ,

• Part (h)

  Find the minimum value for the upper quartile for ΣX. (Round your answer to two decimal places.)
  1512.15(incorrect)

• Part (i)

  Sketch the graph, shade the region, label and scale the horizontal axis for ΣX, and find the probability. (Round your answer to four decimal places.)

  P(1400 < ΣX < 1550) = .1775(incorrect)

Answer 1