3. Using the standard normal distribution table, find the probability values of the following:
P(z < 1.8)
P( z > 1.8)
P(> -2.37)
P(1.76 < Z > 2.57)
any idea how to start this
look here
Z table - Normal Distribution
Nope, this is just an exercise of reading values from a table or using technology to get the values.
If you have it just use excel
P(z < 1.8)
Code:=normsdist(1.8)
P( z > 1.8)
Code:=1-normsdist(1.8)
P(> -2.37)
Code:=1-normsdist(-2.37)
P(1.76 < Z > 2.57) do you mean P(1.76 < Z < 2.57) ? if so
Code:=normsdist(2.57)-normsdist(1.76)
The curve is in these links,
Z table - Normal Distribution
Free Normal Curve Z-Score Calculator