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MATH SOLVE
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This number is in scientific notation. 2.4 × 10-4 Convert the number into standard notation. What is the value? 2.4 × 10-4 =
General
5 months ago
Lifetime of $1 Bills The average lifetime of circulated $1 bills is 18 months. A researcher believes that the average lifetime is not 18 months. He researched the lifetime of 50 $1 bills and found the average lifetime was 18.8 months. The population standard deviation is 2.8 months. At α = 0.02, can it be concluded that the average lifetime of a circulated $1 bill differs from 18 months?
General
5 months ago
An insurance institute conducted tests with crashes of new cars traveling at 6 mi/h. The total cost of the damages was found for a simple random sample of the tested cars and listed below. Find the (a) mean, (b) median, (c) mode, and (d) midrange for the given sample data. Do the different measures of center differ very much? $7 comma 542 $4 comma 853 $8 comma 989 $6 comma 294 $4 comma 215
General
5 months ago
The following are distances (in miles) traveled to the workplace by employees of a certain hospital. 28, 13, 14, 15, 20, 37, 2, 16, 24, 40, 32, 11, 36, 10, 31, 18 Find 25th and 90th percentiles for these distances.
General
5 months ago
put the following in ascending order
General
5 months ago
Dots sells t-shirts ($2) and shorts ($4). In April total sales were $456. People bought 4 times as many t-shirts as shorts. How many t-shirts and shorts did Dots sell? Plz answer helpfully step by step.
General
5 months ago
Scores of an IQ test have a bell-shaped distribution with a mean of 100 and a standard deviation of 13. Use the empirical rule to determine the following. (a) What percentage of people has an IQ score between 87 and 113? (b) What percentage of people has an IQ score less than 74 or greater than 126? (c) What percentage of people has an IQ score greater than 139?
General
5 months ago
A poll conducted in 2013 found that 52% of U.S. adult Twitter users get at least some news on Twitter.40. The standard error for this estimate was 2.4%, and a normal distribution may be used to model the sample proportion. Construct a 99% conﬁdence interval for the fraction of U.S. adult Twitter users who get some news on Twitter, and interpret the conﬁdence interval in context.
General
5 months ago
Requirements for the width of a tractor engine component are 23.23 +/- 0.612 millimeters. The current process produces components with an average width of 23.546 and a population standard deviation of 0.092. The process is normally distributed. If the control limits are set at +/- 2 standard deviations instead of +/- 3 standard deviations from the mean, what is the Cpk of this process?
General
5 months ago
If (x, y) = (3, 4) is a solution of the simultaneous equations.[tex]ax \: + \: by \: = 4 \\ bx \: + \: ay \: = 8[/tex]find the value of a and b.
General
5 months ago
Seven identical model truss bridges are constructed. Each is loaded with increasing masses until it collapses. The masses used are in 50g increments. The loads at failure are 1.40 kg, 1.40 kg, 1.45 kg, 1.50 kg, 1.55 kg, 1.60 kg, and 1.60 kg. If an additional truss is constructed, estimate with 95 % confidence the loaded mass at which the truss will fail.
General
5 months ago
Write an equation in slope-intercept form for the line that passes through the given point and is parallel to the graph of the given equation (-1,-2),3x-y=4
General
5 months ago
How many 3/4 foot ladder rungs can you cut from a 6 foot board?
General
5 months ago
HElp with a,b and c?
General
5 months ago
22,528 divided by 98 and it’s remainder (in long division) Cause I really need help with long division :(
General
5 months ago
At a certain fast-food restaurant, 65% of customers order a chicken sandwich, 44% of customers order french fries, and 76% of customers order a chicken sandwich or french fries (or both items). What is the probability that a randomly selected customer will order both a chicken sandwich and french fries? Write your answer as a decimal (not as a percentage). (If necessary, consult a list of formulas.)
General
5 months ago
Tell whether x and y are in a proportional relationship. If so, find the unit rate.Let y be the temperature x hours after midnight. The temperature is 60 degrees Fahrenheit at midnight and decreases 2 degrees Fahrenheit every 1/2 hour.
General
5 months ago
Find the distance from the point [tex](6, 4)[/tex] to the line [tex]y=x+4[/tex].
General
5 months ago
. A student carried out a simple distillation on a compound known to boil at 124°C and reported an observed boiling point of 116°–117°C. Gas chromatographic analysis of the product showed that the compound was pure, and a calibration of the thermometer indicated that it was accurate. What procedural error might the student have made in setting up the distillation apparatus
General
5 months ago
A treatment is administered to a sample of n = 9 individuals selected from a population with a mean of µ = 80 and a standard deviation of σ = 12. After treatment, the effect size is measured by computing Cohen’s d, and a value of d = 0.50 is obtained. Based on this information, what is the mean for the treated sample??(A) M = 82(B) This cannot be answered without knowing the sample size.(C) M = 6(D) M = 86
General
5 months ago
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