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Chapter 6: Q. 81 (page 358)
Baby elk Refer to Exercise 77 . Use the binomial probability formula to find P(X = 4) . Interpret this value.
The chance of picking 4 out of 7 elks who live to be children is
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Class is over! Mr. Shrager does not always let his statistics class out on time. In fact, he
seems to end class according to his own 鈥渋nternal clock.鈥� The density curve here models
the distribution of Y, the amount of time after class ends (in minutes) when Mr. Shrager
dismisses the class on a randomly selected day. (A negative value indicates he ended class
early.)
a) Find and interpret
b) What is ? Explain your answer.
c)Find the value of k that makes this statement true: localid="1654015283453"
Easy-start mower Refer to Exercise 92 .
a. Calculate and interpret the mean of T.
b. Calculate and interpret the standard deviation of T.
Swim team Hanover High School has the best women's swimming team in the region. The meter freestyle relay team is undefeated this year. In the -meter freestyle relay, each swimmer swims meters. The times, in seconds, for the four swimmers this season are approximately Normally distributed with means and standard deviations as shown. Assuming that the swimmer's individual times are independent, find the probability that the total team time in the meter freestyle relay is less than seconds.follow the four step process.
| Swimmer | Mean | Std.dev |
| Wendy | 55.2 | 2.8 |
| Jill | 58.0 | 3.0 |
| Carmen | 56.3 | 2.6 |
| Latrice | 54.7 | 2.7 |
condition To use a binomial distribution to approximate the count of successes in an SRS, why do we require that the sample size n be less than of the population size ?
A balanced scale You have two scales for measuring weights in a chemistry lab. Both scales give answers that vary a bit in repeated weighings of the same item. If the true weight of a compound is grams (), the first scale produces readings that have mean and standard deviation . The second scale鈥檚 readings have mean and standard deviation . The readingsare independent. Find the mean and standard deviation of the difference between the readings. Interpret each value in context.
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