0what is the perimeter of a rhombus-shaped sign with a 35-cm side?

Rhombus is 4 sided figure with 4 sides same lgenth

preimiter=4 times side
35 times 4=140

perimiter=140 cm

Sample size = 65
mean = 180
variance = 135

Standard Deviation is square root of the variance. So standard deviation = 11.6
Standard Error of the mean = Standard Deviation  / square root of sample size
                                          = 11.6 / 8.06 = 1.44