distributed variables (weight of giant squid)

[sweetkendra]

I am totally stumped on this one, and I don't even know where to begin. Any help will be much appreciated

The weight of the giant squid is a normally distributed variable with an estimated average of 660 lbs. The standard deviation is estimated to be 62.5 lbs. If a giant squid is selected at random, what is the probability that it weights more than 750 lbs? What is the probability that it weighs between 500 and 700 lbs? What is the probability that it weighs between 700 and 750 lbs? If a random sample of 35 giant squid is selected, what is the probability that the mean weight is greater than 690 lbs? and what is the porobability that the mean weight is less than 675 lbs using the 35 selected?

Please help!!

 

[royhaas]

Re: distributed variables

Start by calculating z-scores and using a standard normal distribution table.

 

[sweetkendra]

Ok is the first part done like this?

z=value-mean over standard deviation--------660-750 over 62.5=1.44 =.4251