study log normal probability distribution

The average age of employees in a firm is 35 years. Assume the variable is normally distributed. If the standard deviation is 3 years, then find the probability that the age of a randomly selected employee will be greater than 38 years. => 15.87% or 65.87% or 34.13% or..

The average age of the employees in an organization is 34 years. Assume the variable is normally distributed and the standard deviation is 4 years. If 30 employees are selected at random, then find the probability that the mean age of the employees is greater than 32 y..

The average age of the employees in an organization is 34 years. Assume the variable is normally distributed and the standard deviation is 4. If 25 employees are selected at random, then find the probability that the sample mean age of the employees is less than 35 yea..

If the blood pressure of healthy men is normally distributed with a mean of 120 mm Hg and a standard deviation of 8, and men with blood pressure levels over 140 mm Hg are diagnosed as not healthy, then what is the probability of a type I error? => 0.0062 or 2.5 or 0.49..

Find the probability P (0.65 < z < 1.84) using the standard normal distribution. => 22.49% or 24.29% or 29.42% or 70.93%..

The average protein content in different types of nuts is 20 g, and the standard deviation is 5 g. Assume the variable is normally distributed. If a sample of 16 nuts are selected, then find the probability that the mean of the sample will be greater than 22 g. => 65.5..

Probability problems with finite sample spaces Conditional probability Discrete/continuous random variables Mean, variance of discrete random variable Standard distributions Mean, standard deviation of normally distributed random variable Ce..

According to a school report, the students in that school spend on an average 15 hours in front of computers. Assume the variable is normally distributed and the standard deviation is 2 hours. If 30 students are selected at random, then find the probability that the me..

Find the probability P (0 < z < 1.84) or P (- 1.84 < z < 0) using the standard normal distribution. => - 0.4671 or 0.4671 or 0.4761 or 0.4306..

The Normal distribution: Properties of the Normal distribution Using tables of the Normal distribution The Normal distribution as a model for measurements Sampling distributions: Sampling dis..