1. In a gym class, students have to run a mile. For a 6th grade class, the average was 512 seconds with a standard deviation of 68.
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a) What is the probability of a student running less than 400 seconds?
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b) What is the probability of a student running more than 610 seconds?
c) What is the probability of a student running between 475 and 525 seconds?
2. If Biology test scores were normally distributed with a mean a 78 and a standard deviation

step-by-step explanation:

let

we know that

the y-intercept is the y-coordinate of the point when the value of x is equal to zero

so

the y-coordinate of the point a is the y-intercept

the answer part a) is

the value of y-intercept is

part b) find the slope m

we know that

the value of the slope is equal to

substitute the values

therefore

the answer part b) is

the value of the slope is equal to

the general answer is

the slope is

the value of y-intercept is

answer: 1inch=7days  

12inch=12*7=84days

step-by-step explanation:

where's the diagram?

step-by-step explanation: