[بنت الهواشم]

a survey found that the microwave ovens have an average life of 3 years with standard deviation of 0.5 years assume the variable is
normally distributed what percent of microwave ovens would be
replaced if a warranty of 18 months were given

2.28%
10.56%
0.13%
0.62%

تعبت وانا افكر في ذا السؤال بليييييز احد يشرحلي هوا