Jackson is a builder. He finds that the weekly operating cost varies from week to week. Weekly earnings are normally distributed with a mean of $1,200. What is the probability that the weekly earnings of Jackson are below $1,200?Group of answer choices0.25Cannot be answered based on the information.0.50.75

The annual profit of Harvey Norman follows a normal distribution with mean $26 million and standard deviation $6 million. Assuming that annual profits are independent, what is the probability that the total profit in the next 7 years is greater than $210 million?Group of answer choices0.9610.0780.461None of these answers0.039

Suppose that, on average, electricians earn approximately µ = $54,000 per year in the United States. Assume that the distribution for electricians’ yearly earnings is normally distributed and that the standard deviation is σ = $12,000. What is the probability that the average salary of four randomly selected electricians exceeds $60,000?Multiple Choice0.15870.69150.30850.8413

Weekly household expenditure in a country is normally distributed with a mean $1200 and standard deviation of $300.1. What is the probability that the weekly expenditure of a randomly selected household will be more than $1600?

In 2003, the average stock price for companies making up the S&P 500 was $30, and thestandard deviation was $8.20 (BusinessWeek, Special Annual Issue, Spring 2003). Assumethe stock prices are normally distributed.a. What is the probability that a company will have a stock price of at least $40?b. What is the probability that a company will have a stock price no higher than $20?c. How high does a stock price have to be to put a company in the top 10%?

The random variable X, representing the number of items sold in a week, has the following probability distribution:x 0 1 2 3 4 5 6P(X = x) 0.10 0.20 0.40 0.15 0.05 0.05 0.05On average, how many items are sold in a week? 6.3 3.0 2.2 2.0 0.1428