Search found 18 matches
Probability- hair treatment
I'm really good with math but unfortunately, statistics is my weakest point. I'm trying to do all sorts of statistic practice problems so that I can get better. Any help is greatly appreciated! A particular hair treatment program has caused hair growth in 70% of its users. A random sample of 15 user...
- by jcnissi
Thu Nov 18, 2010 9:55 pm- Forum: Problem Solving
- Topic: Probability- hair treatment
- Replies: 4
- Views: 3341
Defective roll probability
There are 15 rolls of film in a box and 3 are defective. Two rolls are to be selected, one after the other. What is the probability of selecting a defective roll followed by another defective roll?
- by jcnissi
Thu Nov 18, 2010 8:34 pm- Forum: Problem Solving
- Topic: Defective roll probability
- Replies: 3
- Views: 5917
Democrat v. Republican
A certain state legislature consists of 124 members, each of whom is either a democrat or a republican. If there are 18 more republicans than democrats, how many republicans are in the legislature?
a. 44
b. 53
c. 71
d. 80
e. 106
- by jcnissi
Wed Jun 16, 2010 3:39 pm- Forum: Problem Solving
- Topic: Democrat v. Republican
- Replies: 3
- Views: 3191
percent
A retailer sold an appliance for 30 percent above cost, which represented a gross profit of $21.00. For what price did the retailer sell the appliance?
a. $27.30
b. $51.00
c. $63.00
d. $70.00
e. $91.00
- by jcnissi
Mon Jun 14, 2010 2:08 pm- Forum: Problem Solving
- Topic: percent
- Replies: 5
- Views: 4124
Percent
If a subscription for 10 issues of a magazine costs $24.00 and represents a saving of 20% of the cover price, what is the cover price per issue?
a. $1.98
b. $2.40
c. $2.80
d. $2.86
e. $3.00
Answer: E
- by jcnissi
Mon Jun 14, 2010 1:30 pm- Forum: Problem Solving
- Topic: Percent
- Replies: 2
- Views: 2488
Probability
12 Ice cream flavors 10 kinds of candies 8 liquid toppings 5 kinds of nuts with or without whipped cream If a customer makes exactly one selection from each of the five categories shown in the table above, what is the greatest possible number of different ice cream sundaes that a customer can create...
- by jcnissi
Mon Jun 14, 2010 1:05 pm- Forum: Problem Solving
- Topic: Probability
- Replies: 2
- Views: 1961
- by jcnissi
Mon Jun 14, 2010 12:53 pm- Forum: Problem Solving
- Topic: Confused
- Replies: 2
- Views: 1212
Confused
I dont understand the logic, please explain how the answer is E
If 4/[5-(a/b)] = 1, which of the following must be true?
a. a=0
b. b=0
c. a=1
d. b=1
e. a=b
- by jcnissi
Mon Jun 14, 2010 12:44 pm- Forum: Problem Solving
- Topic: Confused
- Replies: 2
- Views: 1212
[x] the greatest integer
If [x] is the greatest integer less than or equal to x, what is the value of [-1.6] + [3.4] + [2.7]?
a. 3
b. 4
c. 5
d. 6
e. 7
I dont understand how the answer is A
Below is what I did:
[-1.6] = -2
[3.4] = 3
[2.7] = 3
Answer: is 4
Please tell me what I did wrong. Thanks.
- by jcnissi
Mon Jun 14, 2010 12:03 pm- Forum: Problem Solving
- Topic: [x] the greatest integer
- Replies: 2
- Views: 1026
Thanks so much for the detailed description. I like to understand the problem conceptually and this helps a lot!
- by jcnissi
Mon Jun 14, 2010 11:59 am- Forum: Problem Solving
- Topic: Percentage
- Replies: 2
- Views: 2722
Percentage
In a certain voting district, 40 percent of the registered voters live in Town A and the rest live in Town B. In the last election, 70 percent of the registered voters from Town A voted. If equal numbers of registered voters from both towns voted, approximately what percent of the registered voters ...
- by jcnissi
Mon Jun 14, 2010 11:04 am- Forum: Problem Solving
- Topic: Percentage
- Replies: 2
- Views: 2722
Area of a circle
What is the area of the circular region with center O shown in the figure above? (Please see attachment)
a. 100Ï€
b. 900n
c. 1,600n
d. 2,500n
e. 4,900n
Please note that n is supposed to represent pie. I dont know how to input that symbol on this blog.
Thanks
- by jcnissi
Sun Jun 13, 2010 9:35 pm- Forum: Problem Solving
- Topic: Area of a circle
- Replies: 2
- Views: 3175
Currency Exchange
Before leaving on a trip, Ms. Rodes exchanged 500 US dollars for German marks at an exchange rate of 1.55 marks per dollar. When the trip was canceled, she exchanged the total amount of marks for dollars at an exchange rate of 0.60 dollar per mark. What was the total amount, in dollars, that she los...
- by jcnissi
Sun Jun 13, 2010 9:18 pm- Forum: Problem Solving
- Topic: Currency Exchange
- Replies: 1
- Views: 1653
seconds into minutes
A certain computer file contains 8,000 data records, each of which needs to be updated. If it takes 20 seconds to update 100 records, then at the same rate, approx. how many minutes will it take to update all of the records in the file? a. 16 b. 27 c. 67 d. 80 e. 160 Please show me how you get the a...
- by jcnissi
Sun Jun 13, 2010 8:33 pm- Forum: Problem Solving
- Topic: seconds into minutes
- Replies: 1
- Views: 2585
Statistics
How many different groups of 3 people can be formed from a group of 5 people?
a. 5
b. 6
c. 8
d. 9
e. 10
- by jcnissi
Sat Jun 12, 2010 11:27 pm- Forum: Problem Solving
- Topic: Statistics
- Replies: 2
- Views: 1113