Khan Academy

Individual bottles of water are filled by a machine at a factory with an amount of water that is approximately norma

.95

Male mosquitos have pretty short lifespans. Males of a certain species have lifespans that are strongly skewed to the right with a mean of 8

.02

A large sleep study involving over 5,0005,0005, comma, 000 American teenagers examined how many hours the participants slept on the weekend.

.05

A company sells eggs whose individual weights are normally distributed with a mean

.07

A car manufacturer crash tests a certain model of car and measures the impact force.

.16

A scientist studying water quality measures the lead level in parts per billion (ppb) at each of 494949 randomly chosen locations along a water line.

.16

A manufacturer makes integrated circuits that each have a resistance layer with a target thickness of 200200200 units. A circuit won't work well if this thickness varies too much from the target value.

.32

1. A pizza chain monitors the total weight of pepperoni that goes on its deluxe pepperoni pizzas to make sure customers are satisfied and product isn't being wasted. 2.A pizza chain records how long it takes customers to receive their delivery orders.

1) .68 2) We cannot calculate this probability because the sampling distribution is not normal.

A human resources manager keeps a record of how many years each employee at a large company has been working in their current role.

We cannot calculate this probability because the sampling distribution is not normal.

Houseflies have pretty short lifespans. Males of a certain species have lifespans that are strongly skewed to the right

We cannot calculate this probability because the sampling distribution is not normal.

Mathieu grows specialty tomatoes that are much larger than typical tomatoes. The distribution of their weights is strongly skewed

We cannot calculate this probability because the sampling distribution is not normal.