10/16/19

Consider the equations below. What is the sum of a, b, and c?
3a + b = 175b + c = 143a + 5c = 41
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10/16/19

In a normal distribution of scores with a mean of 80 and a standard deviation of 5, what percentage of people would score below a 75
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10/16/19

Statistical Distribution Problem...
The length of time, in tens of minutes, that patients spend waiting at a doctor’s surgery is modelled by the continuous random variable T, with the following cumulative distribution function:F(t) =... more
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10/16/19

Two events are defined such that P(A) =.11 and P(B) = .7 and n(B) = 14
How would I go about calculating P(A') and n(U)?
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10/15/19

A simple random sample from a population with a normal distribution of 102 body temperatures has x=98.80 F° and s=0.66 F°
A simple random sample from a population with a normal distribution of 102 body temperatures has x=98.80 F° and s=0.66 F° Construct a 99​% confidence interval estimate of the standard deviation of... more
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10/03/19

I need help solving this
Someone help me to solve thisif a and b are in the domain of a function f and f(a)>f(b) which of the following must be true? a) a≠bb) a<bc) a<_bd) a=0 or b=0e) a=b
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10/03/19

writing an equation that models exponential growth or decay
To begin a bacteria study, a petri dish had 2300 bacteria cells. Each hour since, the number of cells has increased by 11%.Let t be the number of hours since the start of the study. Let y be the... more
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10/03/19

Geometry midpoint of a segment

The midpoint of segment AB is (-2,5). The coordinates of point A are (-7,3). Find the coordinates of point B.
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10/03/19

math homework payments
Rounding in the calculation of monthly interest rates is discouraged. Such rounding can lead to answers different from those presented here. For long-term loans, the differences may be... more
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10/02/19

Julio had 1000 sq. ft. of living space. Then he added a room that was 20 ft. by 10 ft. What was the fractional increase of living space
Julio had 1000 sq. ft. of living space. Then he added a room that was 20 ft. by 10 ft. What was the fractional increase of living space
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10/02/19

Fantasy football draft order probability

My friends and I take part in a 12 person fantasy football league. The draft order is determined by pulling names out of a hat at random during the draft party at a friends house. My friend and I... more
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10/01/19

What is the probability that a weighted coin was selected given that heads was flipped?
5 coins are put in a bag. 2 of the coins are weighted with the probability of flipping heads being three times as great than the probability of flipping tails; the remaining coins are fair. One of... more
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09/30/19

Binomial Probability Distribution
Assume that different groups of couples use a particular method of gender selection and each couple gives birth to one baby. This method is designed to increase the likelihood that each baby will... more
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09/30/19

help step by step
what percentile rank is an age of 21?Professor wise wanted to examine age distribution in the US. she takes a random sample of residents and collects data on age measured in years. she discovered... more
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09/27/19

College students average 7.6 hours of sleep per night with a standard deviation of 45 minutes

If the amount of sleep is normally distributed, what proportion of college students sleep for more than 8.5 hours? Round to 4 decimal places.Probability = 
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09/27/19

Final exam scores in a mathematics course are normally distributed with a mean of 77 and a standard deviation of 7
Exam score Z-score Percentile 81.69 91 1 25.14 Based on the above information and a Z-table, fill in the blanks in the table below.Precision and other notes: (1) Percentiles... more
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09/23/19

Probability on Surfing
John spends 2 hours per day on the internet at the weekend. A day is selected randomly from three weeks.Find the probability John spends 2 hours on the internet on that day.
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09/20/19

Find a polynomial function​ f(x) of least degree having only real coefficients with zeros of​ 0, 2 i​, and 3+i
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09/20/19

Confidence Intervals (Sample Size) 90% cofidence level 2% margin
A political candidate has asked you to conduct a poll to determine what percentage of people support her. If the candidate only wants a 2% margin of error at a 90% confidence level, what size of... more
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09/19/19

If X and Y are two independent random variables then P[X ≥ 2|Y > 1] < P[X ≥ 2].true or false ? justify
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09/18/19

I want to make sure I am doing this problem right!

The marginal cost when producing widgets is $11 per widget. It costs $1150 to produce 100 widgets. Find the cost function. Find the fixed cost. Assume that widgets are priced at $12 per widget.... more
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09/18/19

Write an equation of the parabola in intercept form that passes through (-18, 72) with x-intercepts of -16 and -2 .
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09/18/19

If an arrow is shot upward on the moon with a velocity of 58 m/s, its height (in meters) after t seconds is given by: H=58t-0.83t^2
a) Find the velocity of the arrow after one second.b) Find the velocity of the arrow when t = a.c) When will the arrow hit the moon?d) What is the velocity of the arrow when it hits the moon?
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09/18/19

math probability word problem
11. Mr. Wu’s biology class is writing group reports aboutthe Hawaiian Islands. He has a total of 10 groups.Mr. Wu will assign an island and a topic at randomto each of the groups. No two group... more
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09/17/19

Company Cost Calculus

A company's cost, in dollars, is given by the formula C(q)=8,000 +12q when they are producing q items.a. What does the number 8000 tell you about the company's cost? Be specific as possible and... more
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