Statistics

[Roaa_essam12]

How to sopve parts (b) and (c)?

 

[Dr.Peterson]

How to sopve parts (b) and (c)?

For (b), find z such that P(Z<z) = 1/3, and so on.

For (c), think about conditional probability. What is the probability that a letter is heavy? What is the probability that a letter is heavy and less than 200 g?

For additional help, please show some work so we can see what help you need.

 

[Roaa_essam12]

For (b), find z such that P(Z<z) = 1/3, and so on.

For (c), think about conditional probability. What is the probability that a letter is heavy? What is the probability that a letter is heavy and less than 200 g?

For additional help, please show some work so we can see what help you need.

Here are my solutions but am stuck in part c

 

[Dr.Peterson]

In (b), you skipped over some details, but the result looks right.

In (c), you have the right procedure, but you should check details like signs and directions of comparisons. Are you saying you're stuck because your answer doesn't match what you are told, or because you don't trust what you did?

 

[Roaa_essam12]

In (b), you skipped over some details, but the result looks right.

In (c), you have the right procedure, but you should check details like signs and directions of comparisons. Are you saying you're stuck because your answer doesn't match what you are told, or because you don't trust what you did?

Am not sure abt the signs in part c that’s why am confused

 

[Dr.Peterson]

Am not sure abt the signs in part c that’s why am confused

Just take it bit by bit. If I asked you for the probability that W is between 180 and 200, what calculation would you do?