# TSI Math: Determining Probabilities from Information In a Table

Using this standard normal table, what is the probability that corresponds to a Z-score of 0.09?

Data Analysis, Statistics, and Probability | Statistical Measures |

Mathematics and Statistics Assessment | Statistical Measures |

Product Type | TSI |

TSI | Mathematics and Statistics Assessment TSI Math TSI Mathematics |

TSI Math | Data Analysis, Statistics, and Probability |

TSI Mathematics | Data Analysis, Statistics, and Probability |

Test Prep | TSI |

### Transcript

scored we need the probability we're trying to find the

probability of getting that z score or score less than

that z score Let's according to question here to remember

that a z score is just how far we are

away from the mean this thing in units of standard

deviation like the sigma things down here a standard normal

curve has been studied so closely that we can plop

ourselves down at an easy score on the x axis

and immediately determine the area under the curve to the

left of that value which is the same as the

probability of a z score less than or equal to

ours for any z score we can imagine so let's

think about this We'll need a standard normal table right

here Luckily this table will tell us the probability of

getting the z score we want because it's a left

area ze table So you have to check that if

this were a table that shows the area to the

right of a z score we have to subtract the

value we get from the table from one right one

is one hundred percent or entire area there under the

curve So r z scores point o nine We'll need

to zip line down to the second page where we

see the zero point zero row there right at the

top Then we crab crawl across to the column headed

by point Oh nine i think in a cell at

the intersection of that roman column is our probability which

is what is this point Five three five eight six

Alright we'll round that off a bit and it gives

us a probability of five three five nine Well we

must have looked in a completely different part of the

table to get all the other answers as none of

them are at the intersection of zero point to a

row Okay so the answer is C five three five 00:01:57.842 --> [endTime] nine that's it were statistically shmoop