math
posted by becky .
The weights of adult longtongued fruit bats are known to be normally distributed with a mean of 20.22 grams and a standard deviation of 3.23 grams. What is the probability that a randomly selected bat will:
a) weigh at most 15 grams?
b) weigh less than 30 grams?

Suppose that you select 2 cards without replacement from an ordinary deck of playing cards.
a) If the first card that you select is a heart, what is the probability that the second card that you select is
an heart?
b) If the first card that you select is an ace, what is the probability that the second card that you
select is a spade?
Respond to this Question
Similar Questions

Statistics
A particular fruit's weights are normally distributed, with a mean of 308 grams and a standard deviation of 31 grams. The heaviest 9% of fruits weigh more than how many grams? 
Math
The weights of adult longtongued fruit bats are known to be normally distributed with a mean of 20.22 grams and a standard deviation of 3.23 grams. What is the probability that a randomly selected bat will: a) weigh at most 15 grams? 
statistics
An automatic machine that fills bags of unpopped popcorn is operating properly if the weights are independently and normally distributed with a mean of 114 grams and a standard deviation of 4.9 grams. Find the probability that if 7 … 
statistics
An automatic machine that fills bags of unpopped popcorn is operating properly if the weights are independently and normally distributed with a mean of 114 grams and a standard deviation of 4.9 grams. Find the probability that if 7 … 
Statistics
The worldâ€™s smallest mammal is the bumblebee bat. Such bats are roughly the same size of a large bumblebee. Listed below are the weights (in grams) from a sample of these bats. Assuming that all such bats have a standard deviation … 
Statistics
A particular fruit's weights are normally distributed, with a mean of 353 grams and a standard deviation of 6 grams. If you pick one fruit at random, what is the probability that it will weigh between 334 grams and 344 grams? 
Statistics
A particular fruit's weights are normally distributed, with a mean of 764 grams and a standard deviation of 33 grams. The heaviest 15% of fruits weigh more than how many grams? 
statistics
A particular fruit's weights are normally distributed, with a mean of 594 grams and a standard deviation of 16 grams. If you pick a fruit at random, then 18% of the time, their mean weight will be greater than how many grams? 
statistics
the amount of pyridoxine in grams per multiple vitamin is normally distributed with mean = 110 grams and standard deviation = 25 grams. What is the probability that a randomly selected vitamin will contain between 100 and 110 grams … 
Mathematics
a retailing entrepreneur sells sophisticated running shoes whose weights are normally distributed with mean of 12 grams and a standard deviation of 0,5 grams. (a) what is the probability that a shoe weighs more than 13 grams (b) what …