# Posts by olek

Total # Posts: 10

**maths**

give the solution of the initial-value problem dy/dx=(1+2cos^2(x))/y, (y > 0), y= 1 when x = 0. Thanks.

*May 13, 2011*

**maths**

give the solution of the initial-value problem dx/dy=(1+2cos^2(x))/y, (y > 0), y= 1 when x = 0. Thanks.

*May 12, 2011*

**maths**

The function f is given by ln(e^x − e ^−x) (x > 0). By applying in turn the Composite and Quotient Rules, calculate that gives an expression for each of the following. 1. f!(x) 2. f!!(x)

*May 12, 2011*

**maths**

The distribution of the time taken to run 1000 metres by users of a treadmill in a sports centre has mean 7.2 minutes and standard deviation 2.045 minutes. 1 Choose the option that is closest to the probability that the mean time taken to run 1000 metres for a sample of 30 ...

*May 8, 2011*

**maths**

The distribution of the time taken to run 1000 metres by users of a treadmill in a sports centre has mean 7.2 minutes and standard deviation 2.045 minutes. 1 Choose the option that is closest to the probability that the mean time taken to run 1000 metres for a sample of 30 ...

*May 8, 2011*

**maths**

The number of vehicles entering each of 15 junctions from a motorway during a 20-minute period on a Sunday morning is given below. 7 26 30 26 19 22 12 30 8 28 8 15 26 32 4 1 Choose the option that gives the median number of vehicles entering a junction. Options for Question A ...

*May 8, 2011*

**maths**

A psychological test was given to 92 teenage boys and 68 teenage girls. The test was used to assign a score to each teenager, measured on the ‘worry scale’–0(not worried) to 100 (very worried).A summary of the results is given in the table below. Score on ‘...

*May 8, 2011*

**maths**

A sample of 25users of a gym had their oxygen consumption measured for 30 minutes after arunning exercise.The sample mean and sample standard deviation of the oxygen consumption,in millilitres per kilogram of body weight per minute, were 24.1 and 18.7, respectively. Choose the...

*May 8, 2011*

**maths**

does it mean that: 1. is D 2. is E 3. is B ? Regards.

*May 8, 2011*

**maths**

The heights in centimetres of men in a sample selected at random may be modelled by a normal distribution with mean 180.5 and standard deviation 11.3. 1 Choose the option that is closest to the value above which 30% of the heights of men will lie. Options for Question1 A 174....

*May 8, 2011*

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