Using z-scores to identify probabilities
Interactive practice questions
The table below shows the area under the standard normal curve between $0$0 and a given $z$z-score. Use this table to find the probability that a variable has a $z$z-score less than $z=0.85$z=0.85.
Give your answer to four decimal places.
The average life span of a tortoise is estimated to be approximately $100$100 years, with a standard deviation of $7$7 years.
Use the table below showing the area under the standard normal curve between $0$0 and a given $z$z-score to answer the following questions.
A sprinter is training for a national competition. She runs 400 m in an average time of $75$75 seconds, with a standard deviation of $6$6 seconds.
Use the table below showing the area under the standard normal curve between $0$0 and a given $z$z-score to answer the following questions.
Research scientists have measured the heights of a large number of eucalyptus trees in an area of forest. The average height of these trees is $60$60 m, with a standard deviation of $6$6 m.
Use the table below showing the area under the standard normal curve between $0$0 and a given $z$z-score to answer the following questions.