16 questions
The temperature of Glens Falls in February follows a normal distribution with mean temperature of 23 degrees and a standard of deviation of 4.2 degrees. What percent of the days in February will have temperatures below 23 degrees?
5%
34%
50%
68%
0.0015
0.9985
0.997
none of these
Based on the normal distribution, use a z-table to find P( |z| > 2.5).
0.0062
0.9938
0.0124
none of these
Based on the normal distribution, use a z-table to find P( |z| < 1.2).
0.1151
0.8849
0.7698
none of these
Given a mean of 16 and a standard deviation of 2 for a normal distribution, find the z-score for a data value of 13.
-2
2
1.5
-1.5