Answer:
$1743, $1973, $1789 and $685 are unusual data values. $1973 is very unusual data value.
Step-by-step explanation:
The data values will be unusual if the data values more than 2 standard deviations away from mean.
mean=1260
standard deviation=230
mean-2*standard deviation
1260-2*230
800
mean+2*standard deviation
1720
mean±2*standard deviation=(800,1720)
The values that don't lie in this interval will be unusual.
mean-3*standard deviation
1260-3*230
570
mean+3*standard deviation
1260+3*230
1950
mean±3*standard deviation=(570,1950)
The values that don't lie in this interval will be very unusual.
$1099 lies in the interval mean±2*standard deviation and so it is within the two standard deviation away from mean. So, $1099 is not unusual.
$1651 lies in the interval mean±2*standard deviation and so it is within the two standard deviation away from mean. So, $1651 is not unusual.
$1743 don't lie in the interval mean±2*standard deviation and so it is more than the two standard deviation away from mean. So, $1743 is unusual.
$1973 don't lie in the interval mean±2*standard deviation and so it is more than the two standard deviation away from mean. So, $1973 is unusual. Also, $1973 don't lie in the interval mean±3*standard deviation and so it is more than the three standard deviation away from mean. So, $1973 is very unusual.
$846 lies in the interval mean±2*standard deviation and so it is within the two standard deviation away from mean. So, $846 is not unusual.
$1789 don't lie in the interval mean±2*standard deviation and so it is more than the two standard deviation away from mean. So, $1789 is unusual.
$1398 lies in the interval mean±2*standard deviation and so it is within the two standard deviation away from mean. So, $1398 is not unusual.
$685 don't lie in the interval mean±2*standard deviation and so it is more than the two standard deviation away from mean. So, $685 is unusual.
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