Let z be a random variable with a standard normal distribution.  Find the indicated probabilities. P ( -2.1 < z < -.75) P( -1.40 < z < 2.0) P( 1.25 < z <2.50)

Let x be a random variable that has a normal distribution with a mean of 40 and a standard deviation of 5. After converting the following x-values to z-values, find the following probabilities: P(x < 49)     P(x > 55)

Assume  that    variable    z    has    a    standard    normal    distribution    in    the    population. Use    the    table  of the standard Normal Distribution (attached) to find the    probability    of    a    z    value in    each    of    the    following    intervals: (a)    0    to    1.65;       (b)    1.95    to    ∞;        (c)    -1.30    to    0;       (d)    -∞ to    1.00.

Let z be a random variable with a standard normal distribution. Find the indicated probability. (Round your answer to four decimal places.) P(z ≤ −1.88)

Let z be a random variable with a standard normal distribution. Find the indicated probability. (Round your answer to four decimal places.) P(z z 1.44) =

Let z be a random variable with a standard normal distribution. Find the indicated probability. (Enter your answer to four decimal places.) P(−2.12 ≤ z ≤ 1.10)

let z be a random variable with a standard normal distribution. find the indicated probability P (-0.73< z< 3.12)