normal distribution

If the distribution of IQ scores is bell-shaped, with a mean of 100 and a standard deviation of 15,

If the distribution of IQ scores is bell-shaped, with a mean of 100 and a standard deviation of 15, then approximately ____% of IQ scores are less...
Thread by: math_celebrity, Feb 16, 2022, 0 replies, in forum: Calculator Requests

A fuel injection system is designed to last 18 years, with a standard deviation of 1.4 years. What i

A fuel injection system is designed to last 18 years, with a standard deviation of 1.4 years. What is the probability that a fuel injection system...
Thread by: math_celebrity, Oct 29, 2020, 0 replies, in forum: Calculator Requests

For the normal distribution with parameters μ = 4, σ = 3 ; calculate P(x > 1)

For the normal distribution with parameters μ = 4, σ = 3 ; calculate P(x > 1) Using our calculator, we get P(x > 1) = 0.841345
Thread by: math_celebrity, Dec 30, 2018, 0 replies, in forum: Calculator Requests

Compared to the normal distribution, the t distribution has ___ values at the top and ___ at the tai

Compared to the normal distribution, the t distribution has ___ values at the top and ___ at the tails. a. More; less b. More; more c. Less; less...
Thread by: math_celebrity, Jan 7, 2017, 0 replies, in forum: Calculator Requests