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Breanna Moody

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Donna Densmore verified

Numerade educator

Let X follow a normal distribution X∼N(61,14) hen use the emprical rule to find the percent of the X values which are less than 75 Do not round off. Answer as an exact percentage, but do not enter the percent symbol.

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Donna Densmore verified

Numerade educator

A particular fruit's weights are normally distributed, with a mean of 427 grams and a standard deviation of 12 grams. If you pick one fruit at random, what is the probability that it will weigh between 401 grams and 406 grams?

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Donna Densmore verified

Numerade educator

A manufacturer knows that their items have a normally distributed lifespan, with a mean of 7.6 years, and standard deviation of 2.5 years. If you randomly purchase one item, what is the probability it will last longer than 14 years? Round answer to three decimal places

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Donna Densmore verified

Numerade educator

At a certain nature reserve, the rainfall is known to follow a normal distribution with a mean of 28 with a standard deviation of 4 inches per year. Round each answer to 2 decimal places. Find the 25th percentile, in inches per year. Find the 75th percentile, in inches per year. Find the Interquartile Range (IQR), in inches per year.

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