Wednesday

April 1, 2015

April 1, 2015

Posted by **Chris** on Monday, October 12, 2009 at 12:37pm.

time for this event for boys in secondary school is known to possess a normal distribution with a

mean of 450 seconds and a standard deviation of 50 seconds. Find the probability that a randomly

selected boy in secondary school can run the mile in less than 335 seconds.

- Math -
**MathMate**, Monday, October 12, 2009 at 1:45pmThe mean is 450 seconds and the standard deviation is 50 seconds.

Number of standard deviations below mean

=(450-335)/50 = 2.3

Since it is assumed to be normally distributed, look up the normal distribution table to get the probability of 2.3 standard deviations lower than the mean. (approx. 1%)

- Math -
**Anonymous**, Monday, October 14, 2013 at 10:34pm) A physical fitness association is including the mile run in its secondary-school fitness test. The

time for this event for boys in secondary school is known to possess a normal distribution with a

mean of 450 seconds and a standard deviation of 60 seconds. Find the probability that a randomly

selected boy in secondary school can run the mile in less than 312 seconds.

**Answer this Question**

**Related Questions**

Alegebra - A physical fitness association is including the mile run in its ...

stats - A physical fitness association is including the mile run in its ...

Statistics - A physical fitness association is including the mile run in its ...

statistics - A physical fitness association is including the mile run in its ...

math - A physical fitness association is including the mile run in its ...

math - A physical fitness association is including the mile run in its secondary...

math - Can someone assit me with my two math problems Assume that the salaries ...

English - 1. I am a freshman in high school. 2. I am a freshman of high school...

English - An upper-secondary school is a senior high school. Then is a lower-...

statistics - A Coach found the correlation between physical fitness and athletic...