Aboat a moving with speed 8kmh leaves point p whose position vector is r1=4i+3j heading directly towards point q whose position vector is r2=2i+5j. at the same time another boat b leaves point 0i+0j. if the velocity of boat b is vector vba=root2(-5i+3j), find a. the veloctiy of boat b b. the timetaken when the boats are close c. the shortest distance apart

The function that would correctly calculate the 90% range of likely sample means is given by:

B. 4,200±CONFIDENCE.T(0.10,140,12)

Step-by-step explanation:

In Microsoft Excel, the syntax

 returns the confidence  interval for the population mean, using the students T-distribution.

The standard deviation is given as $140 and the sample size is 12.

In constructing the confidence  interval we use:

Let us substitute the values to get:

We use the T distribution because is unknown