assume that the random variable Xis normally distributed whe

assume that the random variable Xis normally distributed, when mean u=50, and stand deviation = 10, Compute the probability P(55<=X<=70). round to four decimal places

Solution

Answer: C

P(55<=X<=70) = P((55-50)/10 <(X-mean)/s <(70-50)/10)

=P(0.5<Z<2)

=0.2858 (from standard normal table)