QR help

[paris2012]

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hello everyone,
I am not bright when it comes to math. Last math class i took was in high school. i was wondering if someone could help me with this following question.

Q- The weight of Sockeye Salmon is normally distributed with an average weight of 22lbs and a standard deviation of 3lbs. what is the probability than a freshly caught sockeye salmon has a weight of 25lbs or greater?
A. 25%
B. 16%
C. 5%
D. 2.5%
E 8%
ans is B--> 16%

thank you for your time!

 

[Kingsta2426]

You have to memorize the standard deviation values for this questions 68 % fall within 3 pounds on each side of the mean since they are asking for greater than 25 its 100-68 = 32 then divide by 2 to get 16 % because you are only on the high side of the mean.

 

[paris2012]

thanks for replying. i havent taken any statistics course in my life...to understand this problem what would you recommend me to do?

 

[sagarkanodiya]

Try khan academy statistics videos

 

[paris2012]

thank you sagarkanodiya. do you know if statistic based question like these show up a lot of dat?

 

[sagarkanodiya]

Can't be sure but Means, median,mode, Standard Deviation can show up as well as some fellow test takers have gotten 1-2 p-value questions as well.