p (z < .15)
here is the online stats calculator I used in my last reply
http://davidmlane.com/hyperstat/z_table.html
Thank you I will check it out
To find the probability that a standard normal random variable, denoted as Z, is less than a specific value, such as 0.15, you can utilize a standard normal distribution table or a calculator with a standard normal distribution function.
Here's how you can find the value using a standard normal distribution table:
1. Locate the row in the table that corresponds to the tenths digit of the Z value. In this case, the tenths digit is 0.
2. Move along the row to the column that corresponds to the hundredths digit of the Z value. In this case, the hundredths digit is 1.
3. The value in this cell represents the area under the standard normal curve to the left of the Z value. In this case, the value is 0.5596.
Therefore, the probability that Z is less than 0.15 is approximately 0.5596 or 55.96%.
Note: If you are using a calculator with a standard normal distribution function, you can directly input the value of Z (0.15 in this case) and it will output the probability for you.