A Question 8 (1 point) Retake question A teams annual fundraiser contribution amount is normally distributed with a mean
of $2600 and a standard deviation of $260. Find the probability that the annual
fundraiser contributed less than $2340,
2
84%
0.16
12
A
16%
15
0.84
18
A Question 9 (1 point) Retake question

The volume of a sphere is increased by 6%. calculate the corresponding percentage increased in it area.

In a test for esp (extrasensory perception), a subject is told that cards only the experimenter can see contain either a star, a circle, a wave, or a square. as the experimenter looks at each of 20 cards in turn, the subject names the shape on the card. a subject who is just guessing has probability 0.25 of guessing correctly on each card. a. the count of correct guesses in 20 cards has a binomial distribution. what are n and p? b. what is the mean number of correct guesses in 20 cards for subjects who are just guessing? c. what is the probability of exactly 5 correct guesses in 20 cards if a subject is just guessing?

1. according to the internal revenue service, the mean tax refund for the year 2007 was $2,708. assume the standard deviation is $650 and that the amounts refunded follow a normal probability distribution. a. what percent of the refunds are more than $3,000? b. what percent of the refunds are more than $3,000 but less than $4,000? c. what percent of the refunds are less than $2,000?