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For a standardized psychology examination intended for psychology majors, the historical data show that scores have a mean of 505 and a standard deviation of 170. The grading process of this year's exam has just begun. The average score of the 35 exams graded so far is 530.What is the probability that a sample of 35 exams will have a mean score of 530 or more if the exam scores follow the same distribution as in the past?
General
7 months ago
the circular ripple caused by dropping a stone in a pond is increasing in area at a constant rate of 20 square meters per second. Determine how fast the radius of this circular ripple is increasing when the area of the circular region is 25 pi
General
7 months ago
A bag contains purple marbles and white marbles, 34 in total. The number of purple marbles is 1 less than 4 times the number of white marbles. How many purple marbles are there?
General
7 months ago
Solve the equation and show all work. 4|x + 1/3| = 20 i'm kind of stuck hhh
General
7 months ago
The equation S = -16t2 + 34t + 184 models the height of a ball that is thrown upward from the roof of a 184 foot building and falls to the street below. In this equation S is the height in feet of the ball above the ground and t is the time in seconds the ball has traveled. According to this model, how many seconds did it take the ball to reach a height of 91 feet? (round to 1 decimal place)
General
7 months ago
Given that the first term is LaTeX: t_1=5t 1 = 5, and the recursive definition is LaTeX: t_{n+1}=3\cdot t_nt n + 1 = 3 ⋅ t n, what would be the second term (i.e. LaTeX: t_2t 2)Group of answer choices35815
General
7 months ago
Which of the following is an example of a quantitative variable? A) The color of an automobile B) A person's zip code C) A person's height, recorded in inches D) Both B and C
General
7 months ago
Find the absolute extrema of f(x) = e^{x^2+2x}f ( x ) = e x 2 + 2 x on the interval [-2,2][ − 2 , 2 ] first and then use the comparison property to find the lower and upper bounds for I = \displaystyle \int_{-2}^{2} f(x) \, dxI = ∫ − 2 2 f ( x ) d x.
General
7 months ago
A function y(t) satisfies the differential equation dy dt = y4 − 6y3 + 5y2. (a) What are the constant solutions of the equation? (Enter your answers as a comma-separated list.) y = __. (b) For what values of y is y increasing? (Enter your answer in interval notation.) y is in ___.(c) For what values of y is y decreasing? (Enter your answer in interval notation.) y is in ___.
General
7 months ago
You roll a fair die three times. What is the probability of each of the following? a) You roll all 4's. b) You roll all even numbers. c) None of your rolls gets a number divisible by 2. d) You roll at least one 2. e) The numbers you roll are not all 2's.
General
7 months ago
The amount of cola in a 355 ml bottle from a certain company is a random variable with a mean of 355 ml and a standard deviation of 2 ml. For a sample of size 32, perform the following calculations. a. Find an approximate probability that the sample mean is less than 354.8 ml. b. Suppose the amount of cola is distributed as N(355, 4). Find an approximate probability that 10 of the bottles in the sample contain less than 354.8 ml of cola.
General
7 months ago
mrs.jones rented a truck to move to a new apartment the regular price of a truck rental is 150 mrs.jones has a 20% off coupon she wants to know the sale price of truck rental
General
7 months ago
**HELP** ILL GIVE YOU 50 POINTS TO HELP MEuse the vertical line test to determine if the relation [(-6 -2),(-2 6),(0,3),(3,5)] is a function. explain your reason
General
7 months ago
joe bought g: gallons of gasoline for $2.85 per gallon and c: cans for oil for 3.15 dollars. Part A:what expression can be used go determine the total amount joe spent on gasoline and oil?part B:if he bought 8.4 gallons of gasoline and 6 cans of oil, how much will he have spent in all? please help! thank you :D
General
7 months ago
I need help with 8 and 9 please!
General
7 months ago
TO TRANSMIT INFORMATION ON THE INTERNET, LARGE FILES ARE BROKEN INTO PACKETS OF SMALLER SIZES. EACH PACKET HAS 1,500 BYTES OF INFORMATION. AN EQUATION RELATING PACKETS TO BYES OF INFORMATION IS GIVEN BY B=1,500P REPRESENTS THE NUMBER OF PACKETS AND B REPRESENT THE NUMBER OF BYTES OF INFORMATION. A. HOW MANY PACKETS WOULD BE NEEDED TO TRANSMIT 30,000BYTES OF INFORMATION B. HOW MUCH INFORMATION COULD BE TRANSMITTED IN 30,000 PACKETS
General
7 months ago
The average GRE score at the University of Pennsylvania for the incoming class of 2016-2017 was 311. Assume that the standard deviation was 13. If you select a random sample of 40 students, what is the probability that the sample mean will be greater than 308? Round your answer to three decimal places.
General
7 months ago
According to a survey, 50% of Americans were in 2005 satisfied with their job.Assume that the result is true for the current proportion of Americans. A. Find the mean and standard deviation of the proportion for a sample of1000.
General
7 months ago
A survey conducted five years ago by the health center at a university showed that 18% of the students smoked at the time. This year a new survey was conducted on a random sample of 200 students from this university, and it was found that 50 of them smoke. We want to find if these data provide convincing evidence to suggest that the percentage of students who smoke has changed over the last five years. What are the test statistic (Z) and p-value of the test?
General
7 months ago
TO TRANSMIT INFORMATION ON THE INTERNET, LARGE FILES ARE BROKEN INTO PACKETS OF SMALLER SIZES. EACH PACKET HAS 1,500 BYTES OF INFORMATION. AN EQUATION RELATING PACKETS TO BYES OF INFORMATION IS GIVEN BY B=1,500P REPRESENTS THE NUMBER OF PACKETS AND B REPRESENT THE NUMBER OF BYTES OF INFORMATION.A. HOW MANY PACKETS WOULD BE NEEDED TO TRANSMIT 30,000BYTES OF INFORMATIONB. HOW MUCH INFORMATION COULD BE TRANSMITTED IN 30,000 PACKETS
General
7 months ago
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